Change the Version type in Distribtion.Version to be a combination of
a branch ([Int]) and a list of arbitrary tag strings.  This is
intended to be a generic version type, where the interpretation of
ordering is application-dependent.

Distribution.Version also has lots of version-related stuff that is
specific to packages: version ranges (the VersionRange type), and
concrete show/parse functions for package versions.

Added the Simple directory
Moved Build and Install to SImple
moved defaultMain to Simple/Default
toward -Wall cleanliness

Added basic Setup.hs functionality.  Caused a lot of imports, and
cleanup of some modules.  Derived show in various places.

Many dummy functions with "FIX".  Should implement some unit tests
next.