Changes merged into master branch

Thanks for the checks @dpohanlon. I've committed the required changes to the script to make it OK for python 3 in rLAURA5cbd960c5bb7.
Will wait to see if anyone else finds any problems, otherwise I'll merge this into master tomorrow.

I believe that this task is now completed.
@jback, @mwhitehe, @dpohanlon could one or more of you please test this and report back on this task?
The README has been updated with new instructions, so please clone the package, switch to the cmake branch and then try to follow those to build the library, examples and documentation. Try running some of the examples (including the python one) from the install location.

Everything seems to build OK on gcc8, gcc9 and clang8 on CentOS 7 as well as clang10 on MacOS 10.14

The git repository for the code is now public and has been announced on the mailing list.
The repository for the documentation will remain visible only to Laura members.

Have created the rLAURA and rLAURADOCS git repositories, which are currently only visible to Laura members.
The svn repo (rLAURASVN) is now read-only.
Once the git repos have been checked, they can be made public.