components: add a dev-build only helper to log JS errors
http://bugs.activestate.com/show_bug.cgi?id=102021

This copies things from the error console into pystderr.log

(integrated from komodo (trunk) change 83607 by marky)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@14169 b87d16e7-d29f-4ee1-b5ec-817d645d335f