Gtk2::Ex::Datasheet::DBI 2.0

Gtk2::Ex::Datasheet::DBI is a Perl module that is used in conjunction with Gtk2::Perl to give data-aware "datasheet" functionality.
The programmer creates a GUI with Gtk2-Perl (and possibly Gtk2-GladeXML), and then creates a Gtk2::Ex::Datasheet::DBI object, which then "binds" a DBI data source to the datasheet, managing querying, navigating records, applying updates to the database, and error handling.
Enhancements:
- Overhaul SQL clause handling - now all SQL-related stuff is in the sql hash
- Added support for placeholders in where clause
- Added detection of primary key from column_info() ( MySQL & SQL Server only at present )
- Added destroy method, which destroys all signal handlers weve created, then destroys itself ( not working yet )
- Renamed $model_setup->{table} to $model_setup->{from} in dynamic models
- Added legacy mode to support 1.x requests
- Process dynamic models out of order when querying - no need to queue them for later
- Added method revert(), which is a synonym of undo()
- Added graceful handling of failure of $dbh->column_info ( warn to console whats happened )
- Warn to console if $dbh->column_info fails AND we dont have a primary_key definition
- Only ask to apply changes if not read_only
- Addded missing schema request to self
- harmless anyway because we only support automatic renderer selection for MySQL currently
- Updated documentation & cleaned up POD somewhat