Refactoring: removing duplicate code
Add py_type attribute to converters
Bug fixed: attribute value was converted several times when reading from database
Bug in DBSchema.generate_create_script fixed
Fixed warning filter on "table already exists" for MySQL
Many-to-many commit bug fixed
Optimization: avoid unnecessary conversions to/from unicode
Improved exception messages
Update version to 0.4.4
Pony ORM 0.4.4 - Bugfix release