Add definitions for bu_list, wmember, and mk_addmember().
Add definition for BU_LIST_INIT.
Add definitions for WMOP_ values.
Add definition for mk_lfcomb.
Add definition for mk_lcomb.
Fix definitions for mk_lcomb and mk_lfcomb to use wmembers.
Add wrapper for making combinations to brlcad module.
Add Combination class to runtime.py, to wrap previous wrappers.
Separate my .gitignore settings from the defaults.
Ignore Cython's C output files.
Allow setting name manually in BrlCadObject ctor.
Add Context.close().
Close Context manually at end of program execution.
Add support for CSG expressions (add/sub/mul), with a default add{} named
"main". Also, show statement now adds to the current CSG expression,
rather than print to stdout.
Add nice CSG expression to examples/simple.ycad.