downgrade required perl '5.016' to '5.014'
rename `dictlearn.pl` to `dictlearn`
move `clear_data` and `clear_test_results` to Dict::Learn::Db
`Test` schema: fix column name
`Wordclass` resultset: add `export_data`, `import_data`, and `clear_data` methods
`Language` resultset
IoC container includes such modules
add several cli parameters: import/export data; clear data; reset to initial data; `DBIx::Class` debug mode