API Refactor ClassName into DBClassName
API Update PolymorphicForeignKey to use new CompositeDBField and DBClassName
CompositeDBField is now an interface to nested fields on an underlying dataobject, allowing field manipulation to be performed at the field and dataobject level without having to synchronise them manually.
BUG Fix incompatibility in Member_GroupList
Fix regressions in merges from 3.1
BUG Fix Security failing on test classes
BUG Fix postgresql compatibility
Clarify sql encoding of table names
Previously selectFromTable would simply try to select the composite field name. This expands the extraField name to include the children field names and uses CompositeDBField::writeToManipulation to generate the correct SQL for the queries.
The entire framework repo (with the exception of system-generated files) has been amended to respect the 120c line-length limit. This is in preparation for the enforcement of this rule with PHP_CodeSniffer.
