RSB II: Tweaks for Phases 3+

Necromancy can now be used in Phase 4, and the frequency of use in Phase
3 has been increased.  Necro/Tonic combos are now always used instead of
a solitary Necromancy in Phases 3 and 4, as long as the item is
available.  All combos after the first will use a standard Tonic instead
of a Power Tonic, however.