wadindex: close #99: add code for adding zip/wad files to index DB
IndexDB: issue #99: add methods to add WAD/zip files to index DB
Roles/Database: clean up debug output in connect()
Roles/File: Added file[dir|name] attributes

- Added generate_filedir_filename() to populate file[dir|name]
  attributes
WADFile: Added Keysum/File roles; renamed some attribs
WADIndexer: capture levels found with lump_level_regex

- Create a App::WADTools::WADFile object for each WAD indexed
ZipFile: Added File/Keysum roles; call generate_filedir_filename()
idGamesDB: updated error identifiers; keysum is now part of @attributes
idGamesFile: added 'keysum' to attributes list