Adding statistic functionality Part II.

-Fix statistic's table. Add mission status field.
Collect this info and send it to database.
Add to Converter convert functions for mission status.

-Format aircraft, pickup and projectile statistics.
Add get_table_*(Connection, Document number) methods,
which format data into table.

Not ready:

-StatisticState hasn't info yet.

-Delete, update statistics wasn't add yet.

[*] aircraft, pickup, projectile