add the possibility to instantiate the selector only once
add the 2D/3D absolute IPs accessors (2D is equal to dxy wrt the best vertex)
the IPs have to be evaluated wrt the best vertex position
move the configuration of the eleID selectors in the BeginJob
add dep of the eleID selector from PV selector
first added the eleID cfgs
add the composte candidates
Merge pull request #8 from VecbosApp/edm-electrontools-26Dec2013

Addition of the Composite Candidates in DataFormats, also fixes the electron ID configuration