Import other standings

[jpsbur]

To make use of it in non-Testsys environments (say, ejudge for SIS, PCMS for NEERC).

[burunduk3]

support PCMS: 8183ba6
But now update.py just tries to parse monitor file with various ways in hope that one will succeed.
Later we should save monitor type in database with event and use this information.

(So, user will have to choose monitor type when adding contest. Moreover, we should try to parse monitor when user adds it, and don't save event if parse failed.)