Fixes error if table doesn't have a column "title"

This fix will use the last column defined in the values when the field type is select and the values are fetch from a content type.
Fix fatal error when 'debugmode' in simpleforms is enabled.
Merge pull request #1180 from andersonamuller/patch-1

Fixes error if table doesn't have a column "title"
More random filenames for uploaded files.
Bumping version to 1.6.0pl1