Merge pull request #8 from KateTaylor/git_versioning

Git versioning
Merge pull request #9 from wtsi-npg/devel

pull request from wtsi devel to master - release 49.3
Merge pull request #10 from wtsi-npg/master

pull request from wtsi master to devel (release 49.3)
Merge pull request #11 from KateTaylor/git_versioning

add gitver call to 10-refmaker to match the release tag
Find the most recent git tag starting with a numeric to avoid picking up a Jenkins tag during testing