[devel] Use TS files metadata in plugins
The TransformationFiles table of the TS has been prepared long ago to receive additional metadata (FileType, Size, RAWAncestors) but this never was implemented: neither the addition of the information nor its usage.
This PR is only adding the information, and this is tested and works.
This requires certification, although it is tested with dirac-test-plugin and several different plugins
In addition fix the usage of se.getStatus() ;-)
This replaces the MR #416