29-08-16: The program is completely changed - almost written again)

The program is completely changed - almost written again:
1) Now program is multi-user
2) DB changed from SQLite to Derby
3) DB for each pkg-user is encrypted and protected by pkg-user password
4) Passwords of pkg-users are not stored in program - stored and compared (at the start program) only md5-hashes of pkg-users passwords .
5) In addition that passwords in any DB of pkg-users are stored in encrypted form, the DB of each pkg-user is ciphered and password-protected by pkg-user password.