Added script to auto-gen upgrades

It's not perfect, but it handles the vast majority of the work of
generating upgrade scripts. The script relies on the DB2 for LUW parser
in dbsuite but given it's only intended for use by developers that's
probably fine.
Fix removal of objects in upgrade script
Merge branch 'master' into ibm

Sync merge from master to include upgrade scripts in ibm branch
Removed generated scripts

Scripts generated against master aren't valid for upgrades against the
ibm branch