Add fesa-device-name as comment to the related silecs-device-labels in the *.scl file

In order to simplify assignment for PLC-Experts.

Issue triggered from here: https://git.acc.gsi.de/fesa-deploy-units/ValveGauge_DU/pulls/19#issuecomment-13781

Example:

DATA_BLOCK Gauge_SILECS_MP
{ S7_Optimized_Access := 'FALSE' }
AUTHOR:    mmarn
FAMILY:    SILECS
NAME:      BLK_MODE
STRUCT
    sQR06BPX06: _Gauge_SILECS_MP;  //GS01VM1G
    sQR07BPX03: _Gauge_SILECS_MP;  //GS02VM1G
    sQR07BPX06: _Gauge_SILECS_MP;  //GS03VM1G
    sQR01BPX03: _Gauge_SILECS_MP;  //GS04VM1G
    sQR01BPX06: _Gauge_SILECS_MP;  //GS05VM1G