Added a new Test class
Created tests for htc.FilesFile and htc.JobFile.
Merge pull request #2 from GkAntonius/master

tests created for htc
 Doc cleanup
 Add new subpackage for wxPython GUI widgets
 All *_File objects now derive from the abstract class AbinitNcFile.
 More GUI tools.
 New version of PopupMenu based on inheritance.
 Oops, changes were not committed
 Continue to add WX Gui widgets.
 Add new object MDF_File to access the results of the BSE run.
 Add WX panel to analyze the WARNINGS/ERRORS/MESSAGES reported by abinit.