Debian

Add experimental support for building Debian packages as well as RPMs from our collection of spec files.   The makedeb.py script (in scripts) produces a Debian source package (.dsc) from a spec file by executing the %prep rule to populate the build directory, creating an appropriate debian control directory, and packing the whole thing up.   The rest of the package build process is much the same as for an RPM - makemake.py uses the dependency information in the spec files to generate a makefile which builds the packages in the correct order, using pbuilder.