added PickleField, ParsedSource now uses it instead of base64 and TEXT
added PickleField, ParsedSource now uses it instead of base64 and TEXT

Conflicts:

	openquake/db/models.py


Former-commit-id: ff1a4cfae22e22cbcd7631ce89890c77b78b7194 [formerly ff1a4cfae22e22cbcd7631ce89890c77b78b7194 [formerly 557b966f19dba334dc10c6e76f29636294446d6a]]
Former-commit-id: ad257f6bd5cc80edf5d89dcaffbebc10145b8601
Former-commit-id: ad3c7ca077cfd825c0f5728b7f8e4cab7a3daa9b
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine