[CORE][UI] checkbox for inverted search working...
[DB] query by sardinian word
[CORE][DB][UI] reverse search completed ...
unified query and results show methods
[CORE] compacted code and unified common strings
[CORE] paths adapted with QDir::toNativeSeparators(), to be tested on windows
[OTHER] removed useless files under 'core'
[DB] unused methods cleanup
[OTHER] further cleanup
[OTHER] removed binary file from git
[OTHER] removed moc_mainwindow.cpp, updated .gitignore