This is useful for debugging and it allows the index
to be used directly instead of calculated in a
monsndx() function, which has been removed.
I left monsndx() in as a simple short-hand macro for the value
and didn't change the use cases, the reasoning being that this:
monsndx(mon->data)
is arguably a little easier on the eyes than:
mon->data->pmidx
LOW_PM, NON_PM, SPECIAL_PM have been included in the 'enum monnums'
now, instead of as individual macro definitions.
I chose to add the pmidx field as an instance of the enum declaration,
because that has very advantageous results in some debuggers, where it is
then shown as:
pmidx PM_GRAND_MASTER (349) monnums
instead of the less-informative:
pmidx 349 int
Adding the element count to the extern declaration for mons from:
'extern struct permonst *mons[];'
to the more specific declaration to that in src/monst.c:
'extern struct permonst *mons[NUMMONS + 1];'
then allows navigation through the mons array in one of the debuggers.
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