Edouard Tisserant [Wed, 10 Jan 2018 15:36:03 +0100] rev 1897
Extend python<->PLC global variable description "GlobalDesc" to support Initial value setting.
Rebased from dporopat change "add initial value to runtime.py file", which means :
- GlobalDesc is used by some customized beremiz python runtime
- Those runtimes need to know what is initial value of these special variables