beremiz

file isExecutable
automatically detect flags supported by matiec and find correct path
for matiec C library files

This makes possible to use an old matiec and the new one.
<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"/>