CI build versioning

We've set up a new scheme for CI build versioning.

In the "About" dialogue you should see a version something like:

3.0 (Dev CI #415)

This has been confirmed on RISC OS, but other platforms we produce CI
builds for should do the same.

Also, on all platforms, you can visit the URL <about:testament> which will
have a line like:

# This build carries the CI build number '415'


Please use this number when reporting bugs against development versions in
future.


The number matches http://ci.netsurf-browser.org/jenkins/job/netsurf/
build numbers and developers can use them to determine the version any
issue is being reported against.


CI builds are available from:

http://ci.netsurf-browser.org/builds/

--

Michael Drake (tlsa) http://www.netsurf-browser.org/