beremiz

file isExecutable
Pair with matiec a51a3bb4d613. Re-enable resource add/remove, updated CFLAGS, disabled broken global FG test in tests/python
<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"/>