jef e3cfb78796 vector provider update:
- rename maxValue to maximumValue
- rename getUniqueValues to uniqueValues and let it return a list
  of variants instead of strings.
- add protected convertValue to convert string values to attribute values
- update attribute dialog, continuous color dialog, graduated symbol dialog,
  unique value dialog, postgres provider and ogr provider accordingly
- fixes #1250



git-svn-id: http://svn.osgeo.org/qgis/trunk@9196 c8812cc2-4d05-0410-92ff-de0c093fc19c
2008-08-27 22:13:27 +00:00
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