beremiz

file isExecutable
Fix wrong ST code generation in case of several coils connected to each other.


For example,
|---|Var0|----(Var1)--(Var2)---|

Closes #32
<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"/>