more symbol set stuff (trunk only)

- Instead of checking for the Rogue level, check which
  graphics are engaged (PRIMARY or ROGUESET) in the
  SYMHANDLING() macro.

- track which graphics are active through 'currentgraphics'.

- Instead of symset and roguesymset and symhandling and roguehandling
  variables, have symset and symhandling be arrays of two, with the
  following indexes:
	PRIMARY
	ROGUESET
  That reduced the amount of repeated code.
  (Not to be confused with the 'symset' and 'roguesymset' config file options
   both of which still exist)

- the symbol routines were adjusted to pass
the index , rather than 'rogueflag' and coding to roguesymset etc.

Other than fixing bugs that are encountered, this is probably
the last of the symbol stuff, with the exception of
making the symset and roguesymset config file options
accept the keyword value "default".

sys/unix/unixmain.c

@@ -373,7 +373,7 @@ char *argv[];
 #ifdef ASCIIGRAPH
 				load_symset("IBMGraphics", PRIMARY);
 				load_symset("RogueIBM", ROGUESET);
-				switch_graphics(TRUE);
+				switch_symbols(TRUE);
 #endif
 			}
 			break;
@@ -382,7 +382,7 @@ char *argv[];
 			if (!strncmpi(argv[0]+1, "DEC", 3)) {
 #ifdef ASCIIGRAPH
 				load_symset("DECGraphics", PRIMARY);
-				switch_graphics(TRUE);
+				switch_symbols(TRUE);
 #endif
 			}
 			break;