Begin modularization of Kepler-Discoveries repository

* Created lib tree at the top level of the repository for common Perl Modules:
  o IPAC_AsciiTable.pm -- read and write IPAC ASCII Tables.
  o Utilities.pm -- miscellaneous (global) string, array, and astrocoords functions
  o XAQ.pm -- Exoplanet Archive Query class
  o XA.pm -- Exoplanet Archive API class.  This module is currently specific to gen_kepler_flc.pl
* Stripped the modules out of the flc application gen_kepler_flc.pl, and replaced with
  import of the modules from the lib folder.
* Added test folders t to lib and flc.  No tests written yet.
* Changed the gen_kepler_flc.pl interface to be just a single planet, rather
  than looping over all the planets.  Should eventually be a command-line option.

Still ToDo:

* These changes need to be propagated to the names_table application.
* Write tests for each module and the gen_kepler_flc.pl script