parsec: general cleanup, retest everything

Get rid of br2_parsec, since there are just too many possible variations on that file.

Blow up the gem5 vs qemu table to make it saner, add missing aarch64 entries.

Make sections titles describing number of cores and memory size emulator agnostic.

build

@@ -14,7 +14,7 @@ linux_kernel_custom_config_file=''
 post_script_args=''
 qemu_sdl='--enable-sdl --with-sdlabi=2.0'
 v=0
-while getopts 'a:b:c:CGgj:hIiK:klp:qSv' OPT; do
+while getopts 'a:B:b:CGgj:hIiK:klp:qSv' OPT; do
   case "$OPT" in
     a)
       arch="$OPTARG"