ShowDiff.pl added. Not great, possibly good enough.
ShowDiff.pl added. Not great, possibly good enough.

git-svn-id: d5d822c24d202bd4326d3375d222c240844088d1@609 19b06628-3642-0410-8fdd-33ae7300e995

amahabal/Seqsee,amahabal/Seqsee