[Ohrrpgce] SVN: teeemcee/12523 mapedit_sanity_check_npc_instances now checks for negative NPC ids and i

[subversion at HamsterRepublic.com]

teeemcee
2021-09-30 02:05:20 -0700 (Thu, 30 Sep 2021)
163
mapedit_sanity_check_npc_instances now checks for negative NPC ids and invalid pools

Also, showerror is normally used for corrupt data warnings, not visible_debug
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U   wip/mapsubs.bas