new 'hq' scaler; new '--accel' option

git-svn-id: svn://svn.code.sf.net/p/sc2/code/trunk@1976 8092fc87-c524-0410-9efc-e669fe64eaf9

sc2/doc/users/manual.txt

@@ -39,8 +39,9 @@ permits use of any screen resolution.
 
 	-c               (or --scale=mode)
 
-Graphics scaling mode (bilinear, biadapt, biadv or triscan). Default is
+Graphics scaling mode (bilinear, biadapt, biadv, triscan, hq or none).
-none. Try these to get smoother graphics with cost on performance.
+Default is none. Try these to get smoother graphics with cost on
+performance.
 
 	-b               (or --meleezoom=mode)
 
@@ -173,6 +174,17 @@ The default.
 Use the PC intro and ending sequences and slide shows. These will be also
 played if you do not have 3DO movies, regardless of -i option.
 
+NOT OFFICIALLY SUPPORTED OPTIONS
+
+The following options may not exist in all builds and can change without
+notice at any time.
+
+	--accel          (no short version)
+
+Can be "none", "detect", "mmx", "3dnow", "sse" (also "altivec" if/when
+added; or other platforms). Specifies which platform accelerations
+to use for graphics and sound, if any. All specific platform code can
+only be used when compiled in.
 
 
 			     BUG REPORTS