Make sure SIOsize is >= MaxTermSize

Various buffers in AllocSort depend on the IOsize parameter. At the
main level this is >= MaxTermSize, but this was not the case when
sorting function args, dollar variables.

Fixes the examples in #80 #292

sources/setfile.c

@@ -604,6 +604,8 @@ int AllocSetups(VOID)
 	AM.SMaxFpatches = sp->value;
 	sp = GetSetupPar((UBYTE *)"subsortiosize");
 	AM.SIOsize = sp->value;
+	/* As for IOsize, make sure SIOsize is at least as large as AM.MaxTer. */
+	if ( AM.SIOsize < AM.MaxTer ) { AM.SIOsize = AM.MaxTer; sp->value = AM.SIOsize; }
 	sp = GetSetupPar((UBYTE *)"spectatorsize");
 	AM.SpectatorSize = sp->value;
 /*

sources/sort.c

@@ -957,7 +957,12 @@ LONG EndSort(PHEAD WORD *buffer, int par)
 						UNLOCK(newout->pthreadslock);
 #endif
 					}
-					else if ( newout->handle >= 0 ) {	/* output too large */
+					else if ( newout->handle >= 0 ) {
+/*
+						We land here if par == 1 (function arg sort) and PutOut has created a file.
+						This means that the term is larger than SIOsize, which we ensure is at least
+						as large as MaxTermSize in setfile.c. Thus we know already that the term won't fit.
+*/
 TooLarge:
 						MLOCK(ErrorMessageLock);
 						MesPrint("(1)Output should fit inside a single term. Increase MaxTermSize?");