[Featureserver] SQLite bug fixes

[Peter Robins]

Attached a diff file fixing the following problems with DataSource/SQLite.py

1. update feature attributes now works
2. bbox query would only work if there were also an attribute query;
now works on its own

Date last modified is now set when the geometry is changed; previously
it was only set if attributes were changed.
I also added a 'not equal' operator to attribute queries: 'ne' - might
be a good idea to add this to other datasources as well
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