Added "runtime.py", a file that is executed in python thread in runtime, before handling python_eval FBs requests. Added small python editor taken from wxPython demo, and appropriate icon and button to launch it.
<xsd:attribute name="Compiler" type="xsd:string" use="optional" default="gcc"/>
<xsd:attribute name="CFLAGS" type="xsd:string" use="required"/>
<xsd:attribute name="Linker" type="xsd:string" use="optional" default="g++"/>
<xsd:attribute name="LDFLAGS" type="xsd:string" use="required"/>