scimoz: add better APIs for methods which take a length followed by a string
http://bugs.activestate.com/show_bug.cgi?id=95927

This should make these methods more JS/Python-friendly.

(integrated from komodo (trunk) change 81208 by marky)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@13361 b87d16e7-d29f-4ee1-b5ec-817d645d335f