CBaseMonster: Add MSF_MULTIPLAYER flag, so monsters can be made available in multiplayer on a per-class basis.

src/gs-entbase/server/basemonster.cpp

@@ -47,7 +47,8 @@ enumflags
 	MSF_RESERVED3,
 	MSF_WAITFORSCRIPT,
 	MSF_PREDISASTER,
-	MSF_FADECORPSE
+	MSF_FADECORPSE,
+	MSF_MULTIPLAYER
 };
 
 class CBaseMonster:CBaseEntity
@@ -419,6 +420,7 @@ void
 CBaseMonster::CBaseMonster(void)
 {
 	/* FIXME: Put this somewhere else? */
+	if (!(spawnflags & MSF_MULTIPLAYER))
 	if (!(cvar("coop") == 1 || cvar("sv_playerslots") == 1)) {
 		remove(this);
 		return;

src/server/scihunt/monster_scientist.cpp

@@ -661,6 +661,8 @@ void monster_scientist::Respawn(void)
 
 void monster_scientist::monster_scientist(void)
 {
+	spawnflags |= MSF_MULTIPLAYER;
+
 	for (int i = 0; i < sci_sndpain.length; i++) {
 		precache_sound(sci_sndpain[i]);
 	}