Add missing cascading metadata elements #1086
Add support for DITA 1.3 profiling attribute group labels #1635
Clean map pull processing for format attribute
Add support for DITA 1.3 cascade attribute #1636

Tests use nomerge default because previous versions have implemented
nomerge behavior even though it has not been compliant with DITA 1.2.
Remove profiling attribute duplicate removal

The duplicate removal should be group aware and using plain
distinct-values does not work there.
Update test suite
Add support for mixing groups and plain tokens in profiling #1635