Merge pull request #12 from wtsi-npg/master

pull request from wtsi master to devel (release 56.3)
get cluster densities from InterOp/TileMetricsOut.bin
when filtering list of runs to load use actual number of runs
added test data for tracking database
Merge pull request #2 from wtsi-npg/devel

Devel
updated Changes file
updated manifest
Merge pull request #13 from srl147/devel

get cluster densities from InterOp/TileMetricsOut.bin
Merge pull request #14 from wtsi-npg/devel

pull request from wtsi devel to master to create release 56.4