moved app messaging to Log::Report; validation of vep data before updating db tables; tests scripts test data insert to sqlite in-memory db; switched off console output of vep data structures for devel; trialing optional bootstrap 3.3.6 css

simplified args passed in NGS.pm method calls - src_data & data_file are equivalent so replaced all refs to former with latter; simplified config block in _parse()

wrapped call to NGS::VEP in try/catch to handle die via 500.tt - works for tests as well; test for invalid filename; display list of valid filenames in upload page

application errors handled by 500.tt template; filename format error handling