Add relative string for livesite

This PR needs careful review. In the first commit I add a new LIVESITE_PATH which omits the http://www.xxxx.com part of the LIVESITE url.

The remaining commits are changes from LIVESITE to LIVESITE_PATH in various files. I have put the changes to each file in a separate commit so it is easy to drop a specific file from the PR if needed. I have tried to be very careful with changing LIVESITE to LIVESITE_PATH - but I have not been able to test all of these so they do need careful review to make sure I have not introduced typos and to make sure that switching to LIVESITE_PATH is not going to have any unintended consequences.

S