* BUG: Correctly raise an error when trying to use NULL on classes
implementing the _operators interface.
* NEW: The _convert interface now must handle conversions from any
datatype.
[GB.GSL]
* NEW: Automatic conversion from numbers to Complex.
* NEW: Start implementating the Vector class.
git-svn-id: svn://localhost/gambas/trunk@4913 867c0c6c-44f3-4631-809d-bfa615b0a4ec
