Resolve shift warning; add common error message; add to all exception common message; allow multiple select keys
Allow primary key to be a list type
Remove revision/version
Revert multi prim_key changes, if lookup field is multi key, take the first one as primary key; add new api_lkeys API to get api look-up keys from DAS map
Show aggregators when filter and aggregators are present in a query
Remove __revision__ and __version__ since we no longer use CVS
Add module docs; apilkeys cache and slighly modify docstrings
Switch from using prim_key to api_lkeys in a code which decides to pass API for processing. This is necessary since prim_key has ambiguity when multiple keys will be selected. Instead we need to use api look-up keys and compare them with DAS query selection keys
Add fakeFileLumis4dataset to support file,lumi dataset=/a/b/c query
Add filelumis4dataset API to support file,lumi dataset=/a/b/c queries