beremiz

file isExecutable
fix issue that in Debug mode LD instance doesn't show correctly its state after
continuation of FBD_Connector.

Previously state signals doesn't propogate through FBD_Connector.
<xsd:attribute name="Command" type="xsd:string" use="optional" default="make -C %(buildpath)s all BEREMIZSRC=%(src)s BEREMIZCFLAGS=%(cflags)s MD5=%(md5)s USE_BEREMIZ=1 FROM_BEREMIZ=1"/>