Move gettimeofay() from org.conman.sys to org.conman.process.

I think I want org.conman.sys to be just system definitions with no functions,
and org.conman.process is about the best place for gettimeofday().  So move
it there.
Check for Lua version and handle appropriately.

I'm adding Lua 5.2+ support in this codebase.  I need this for this module
to get widely used for a project I'm working on.
Make END and CPU "(undefined)" instead of erroring out.
Always use paths.h

Let's see if paths.h is generally used, or not.