[subset] Minor
[subset] Comments
[subset] Remove unreferenced features
Implement __ne__ when __eq__ is defined
Add @total_ordering to classes with __lt__
Return NotImplemented
py23 fixes for psLib and t1Lib

Still not working with Python 3 as psLib's PSTokenizer subclasses
StringIO and expects it to have buf and pos.  Need to rewrite
this to implement StringIO internally.
Fix compiling back Times New Roman font

This has been broken since f2c2b4d38bd7bba23db71936262db984e4b7aebb,
assigning a new object to a function argument will not change the
original one, so we need to return the modified list.
Remove total_ordering

Upon studying further, we don't need it.  Since we only expect
comparing objects of the same type, just having __lt__ is enough.
Fix ClassDef

Ouch.  Broke it in 63b257e677993295ee015e02b92ff438a5e91135.
[subset] Remove redundant language systems

After subsetting, remove language systems that are effectively
the same as the default language system.
Minor
[subset] Remove unnecessary workaround
Make the test runnable