Enable LumiCorrection algorithm in LumiBased splitting
Naming conventions of UR* parameters in TW. #4544

Review the naming convention of parameters like resturl, resturi,
instance etc.

Take for example a REST URI (e.g.: '/crabserver/prod/workflowdb'). The
first field in the REST URI (e.g. 'crabserver') will be called the
server API. The second field (e.g. 'prod', 'preprod', 'dev') is the REST
database instance. The third field (e.g. 'workflowdb', 'info',
'filemetadata') is the REST API.
Upload warning message if the inds has lumis split across files
Return warnings to the client. Fixes #4547
Merge pull request #4552 from mmascher/lumiCorrection

LumiCorrection + warning messages + naming conventions of UR*