Add RawHeader access

Modify signature of Process. Do not provide Event* anymore but add
Getters instead.
Add svn commit HISTORY
Documentation of new RawHeader feature

-Check documentation of all the RawHeader methods just added
-Typo fix in Pi0Reconstruction
-Update templateAnalyzer with new signature
Add GetMCSimple()

Switch to map for MCSimple
Remove it from the process method
Add all necessary Getters for MCSimple
Add missing doc

Include IOHandler in Analyzer
Move fMCSimple inside Analyzer. 

Remove the need of passing it from BaseAnalysis when each Analyzer has
its own MCSimple anyway.
Modified HISTORY for fMCSimple change
Fix crash in MCSimple when fNKineParts is 0
Fix the PhysicsObjects (again?)
Fix for compiling on lxplus
History modification
-Fix last bug with PhysicsObject libraries in case of multiple objects
-Update History with revision number
-Update NA62AnalysisBuilder to update the user space (including env)
Small fix in NA62AnalysisBuilder
Modified HISTORY for fMCSimple change
Merge branch 'develop' of github.com:nlurkin/NA62Analysis into develop