- search($criteria,...) if $criteria is a string, search in all data
columns or - if set - $this->columns_to_search
--> that's NOT backward compatible - though a quick scan through the
EGroupware code showed no use of $criteria as string!
- this automatic search, appends and prepends '%' only, if search
pattern does NOT already contain wildcards (* or ?)
--> allows to search "test*" for values starting with test
- improved handling of db timestamps (Y-m-d H:i:s), to allow to search
for them too (eg. "2009-08-*")
- so_sql_cf::get_rows() now calls parent
- so_sql_cf::search() adds DISTINCT if query contains a join
--> ToDo: remove custom search code from apps, to give consitent search
behavior in all apps and simplify the code there
