Issue #69 - Removed distribute_stocks as it wasn't used by anything. Fixed method name for creating new user in initial_data.sql. Fixed name collision in distribute_stocks_to.
Issue #69 - Translated and reformated zlecenia_uz, transakcje_na_zasobie, transakcje_uz, dobra_uz, ostatnia_transakcja, najlepsza_sprzedaz and najlepsze_kupno.
Issue #69 - Translated session managment procedures from helper_procedures.sql. Fixed typo in helper_procedures.sql:line 5. Fixed invalid procedures names in queries in PostgreDataSession implementation.
Issue #69 - Changed name procedure name get_available_stocks to available_stocks. Translated procedures zlec_sprzedaz, zlec_kupno to english as create_sell_order, create_buy_order. Moved available_stocks and create_user procedures to Varia section in helper_procedures.sql.
Issue #69 - Refactored and translated insides of process_sell_order to english. Also fixed, previously unknown, bug in process_sell_order and process_buy_order - it was possible, when processing order, to match it with orders of the same user.
Issue #69 - Translated przenies_zasob to english as transfer_resources.