feat(config): the DOS wedge on in mc64, the transcendental functions off

The wedge's @, @$, and @<command> read the error channel, list a directory,
and send DOS commands from direct mode, so the F-keys' @8$-style commands work.
BASIC has room for it only without the transcendental functions, which stay
?NOT IMPLEMENTED until BASIC evaluates functions at all.

src/,,config_mc64.s

@@ -12,6 +12,8 @@
 ; - BCD_SAFE_INTERRUPTS is off, for IRQ entry timing closer to the original
 ; - ARNITECH_CONTROLLER: IOINIT sets CIA1's TOD on 50 Hz and from the Arnitech controller's clock,
 ;   and the Arnitech jump table is at $FF00 (src/kernal/arnitech)
+; - DOS_WEDGE is on, so the F-keys' '@8$'-style commands work, and TRANSCENDENTAL_FUNCTIONS
+;   is off to make room for it
 
 
 
@@ -101,7 +103,7 @@
 ; --- Software features
 
 ;; #CONFIG# PANIC_SCREEN               YES
-;; #CONFIG# DOS_WEDGE                  NO
+;; #CONFIG# DOS_WEDGE                  YES
 ;; #CONFIG# TAPE_WEDGE                 NO
 ;; #CONFIG# TAPE_HEAD_ALIGN            NO
 ;; #CONFIG# BCD_SAFE_INTERRUPTS        NO
@@ -111,7 +113,7 @@
 ; --- BASIC features
 
 ;; #CONFIG# ORIGINAL_UNPATCHED_BASIC   YES
-;; #CONFIG# TRANSCENDENTAL_FUNCTIONS   YES
+;; #CONFIG# TRANSCENDENTAL_FUNCTIONS   NO
 
 
 ; --- Eye candy