revived A⍴B and ,B optimizations

git-svn-id: http://svn.savannah.gnu.org/svn/apl/trunk@445 bd74f7bd-1a55-4bac-9fab-68015b139e80
fixed optimized A⍴B

git-svn-id: http://svn.savannah.gnu.org/svn/apl/trunk@446 bd74f7bd-1a55-4bac-9fab-68015b139e80
made performance counters ./configure-able

git-svn-id: http://svn.savannah.gnu.org/svn/apl/trunk@447 bd74f7bd-1a55-4bac-9fab-68015b139e80
git-svn-id: http://svn.savannah.gnu.org/svn/apl/trunk@448 bd74f7bd-1a55-4bac-9fab-68015b139e80
David's ⍞ patch

git-svn-id: http://svn.savannah.gnu.org/svn/apl/trunk@449 bd74f7bd-1a55-4bac-9fab-68015b139e80