* Follow up to a942853.
* Removed ADJUST_SKILL_DAMAGE define so that the mapflag is always enabled.
* Cleaned up atcommand mapinfo and skill_damage mapflag interaction.
* Cleaned up atcommand mapflag to not allow setting of special mapflags that require extra arguments (Please use script command setmapflag).
* Using script command setmapflag for MF_NOSAVE will default to SavePoint.
* Using script command setmapflag for MF_PVP_NIGHTMAREDROP will default to normal official drop values.
* Exported constants for skill_damage mapflag types.
Thanks to @ecdarreola, @cydh, and @Lemongrass3110!