Fix id conflict for FlagsMinusSched

Conflicts with id in command/flags.xml.  Renamed to FlagsCatMinusSched to be consistent with established naming convention.
Fix id conflict for IndexSchedule

Conflicts with id in opcodes/schedule.xml.  Renamed to IndexNstance to be consistent with convention in other files.
Merge pull request #2 from kengregson/id-conflicts

Id conflicts prevented pdf manual generation