Accounting app with scripts exporting accounting-related data in CSV-format.

Output was largely based on exported data from previous site.

Available export commands:

  * Donations
  * Project payouts
  * Orders
Accounting: import of CSV from bank and Docdata (payouts & donations).

Includes:

  * Generic incremental CSV import functionality, available from the  interface.
  * Models for 'raw' CSV data.
  * Minimal admin interface enhancements.
  * Decent test coverage with actual (anonimized) test data.
  * Single initial South migration.
Document potential problem with 'latest_payment'.
Fixed bug relating to uniqueness constraint.
Various admin improvements.
Removed reference to previous UTF-8 CSV util.

Those darn PYC files!
Execute imports in a single transaction.
Removed unused import statement.
Proper Bitbucket requirement plus newline fixup (again).

Conflicts:
	requirements.txt
Comment explaining deprecation status of scripts.
Removed redundant files.
Merge pull request #1002 from dokterbob/accounting

Accounting app