FIELD OF THE INVENTION The present Invention relates to controls for vehicular master clutches, preferably wet friction dutches, utilized in partially or fully automated mechanical transmission systems. In particular, the present Invention relates to a control for a vehicle master clutch, preferably a wet clutch, wherein at idle conditions, the master chltch is engaged to a relatively low idle drive torque torque transfer capacity. DESCRIPTION OF THE PRIOR ART Partlally and fully automated vehicular mechanical transmission systems utilizing friction master clutches are known in the prior art, as may be seen by reference to U.S. Pats. No. 4,361,060; 4,596,986; 4,850,236; 4,648,290; 5,389.053; 5,487,004; 5,487,005 and 5,509,867, the disclosures of which are incorporated herein by reference. Controls for automated friction master clutches, usually dry friction dutches, utilized in vehicular automated transmission systems are known, as may be seen by reference to U.S. Pats. No. 4,081,065; 4,646,891; 4,860,861; 5,275,267; 5,293,316; 5,314,050; 5.337,868; 5,337,874; 5,383.823; 5,393,274; 5,411.124; 5,404,301; 5,630,773; 5,624.350 and 5.738,609. the disclosures of which are incorporated herein by reference. 2 SUMMARY OF THE INVENTION According to the present inveniton, a control for an automated master friction clutch, such as a wet frict'on clutch, is provided which utilizes the information available on industry standard electronic vehicular data links, such as data links conforming to the SAE J1922, SAE J1939 and/Or ISO 11898 protocols, to provide improved clutch control and clutch functional features as compared to the prior art. By sensing and controlling engine flywheel torque utilizing an electronically controHed engine connected to an Industry standard data HnL (see U.S. Pat. No. 5,609,867, the disclosure of which is incorporated herein by reference), and controlling the engaged condition of a master motion clutch, a master clutch drive train system providing an Vge to move" at idle conditions is provided. Accordingly, N Is an object of the present invention to provide an Improved control for a vehicle drive line including a master friction clutch which wHJ provide an "urge-to-move" torque at Idle conditions. This and other objects and advantages of the present invention will become apparent from a reading of the following description of the preferred embodiment taken in connection with the attached drawings. ( , BRIEF DESCRIPTION OF ^DRAWINGS li and parastic engine torque at a given engine speed is determined by a lookup table which uses the information of engine friction torque as an input to the table. 2. The method as claimed in claim 1 wherein said idle drive torque value is selected to be sufficient to move the vehicle on level ground if the vehicle brakes are not applied, but not sufficient to move the vehicle on level ground if the vehicle brakes are applied. 3. The method as claimed in claim 1 wherein said idle drive torque is less than ten percent (10%) of the rated input torque of the transmission. 12. 4- The method as claimed in claim 1 wherein said transmission has a rated input torque in the range of 554 to 830 Nm (400 to 600 pound-feet) and wherein said idle drive torque is in the range of 27.7 to 55.4 Nm (20 to 40 pound-feet). 5. The method as claimed in claim 1 wherein step <3) additionally requires that said transmission be engaged in a starting gear. 6. The method as claimed in claim 1 wherein step (3) additional ly requires that said transmission be engaged in one of a low speed ratio and a reverse ratio. 7. The method as claimed in claim 1 wherein said first reference value equals about zero throttle displacement. 8. The method as claimed in claim 1 wherein said second reference value equals about 5 KPH (about 3 MPH). 9. The method as claimed in claim 1 wherein said selected speed is the preselected idle speed of said engine. 13. 10. A vehicular drive line system (10) having a fuel-controlled engine (12) comprising an output member (18)" a multiple-speed, change-geartransmission (16) having an iniput shaft (20) drivingly coupled to said output member by a master friction clutch (14), a clutch operator (30) for selectively engaging and disengaging said clutch (14) to provide a selected torque transfer capacity from said output member (IS) to said input shaft (20), an operator-set throttle device (33A) for manual requesting of fuel supply to said engine (12)* an engine fptrontroller (28) for controlling fueling of said engine (12)" said controller effective to fuel said engine (12) to cause said engine (12) to rotate at a selected engine speed and to develop a selected torque, a system controller (34) for receiving input signals comprising signals indicative of (i) displacement of said throttle device and (ii) speed of said vehicle, and for processing same according to logic rules to issue command output signals to system actuators having said clutch operator and said engine controller, said system comprising: 14. <1> means for storing a preselected an idle drive torque value; (2) means for comparing throttle device displacement to a first reference value and vehicle speed to second reference value when the vehicle is stopped or in a low-speed condition; and (3) means for, if throttle device displacment is no greater than said first reference value and vehicle speed is less than said second reference value, causing said engine to rotate at a selected speed and to develop said idle drive torque at the output member thereof and (ii) causing said clutch to be partially engaged to have a torque transfer capacity equal to said idle drive torque" the system being characterized in that said engine controller comprises means causing said engine 15- to generate a gross engine torque