New branch with different histo classes, now deriving from two base classes
Rearranged tree analysis so no for each category/flag there is a specific selection
Implemented categorizations (ivfselections.cpp), some new histograms and a module that modifies the read-in vertex (e.g. to fix the 'PrimaryDecay' bug)
Moved some files to ivf_treeAnalysis folder
Changed plotting module for ivf_treeAnalysis
Merge branch 'new_an' into own_zbb_an --> now 'ivf_treeAnalysis' and 'zsvanalysis' are in the same branch

Conflicts:
	.gitignore