libwt-doc: conflicts-with-version witty-doc (<< 3.1.0a-1~)

# Debian bug #736360 and https://lists.debian.org/debian-mentors/2012/11/msg00310.html
libwt-doc: embedded-javascript-library usr/share/doc/libwt-doc/reference/html/jquery.js please use libjs-jquery
