Refactor histFactory and treeFactory

[blinkseb]

HistFactory and treeFactory share most of their code, and were a pain to maintain since adding a feature in one means duplicating the code to add the same thing in the other. This PR refactors the code, allowing to share the code between the two utilities. It's now the same executable, and the mode in which running is decided by the name of the executable:

• histFactory.exe -> histogram mode
• treeFactory.exe -> tree mode

Nothing change for the user, the scripts createPlotter.sh and createSkimmer.sh are still there and work as before. Only difference is that they are now both in the same directory.

• First commit store locally json-cpp and tclap. They are small, so no need to download and build them every time.
• Second commit is the actual refactoring
• Third commit moves condorTools from histFactory to python. When building inside cmssw, you must now import cp3_llbb.CommonTools.condorTools
• Fourth commit removes the old histFactory and treeFactory.

During the refactoring, I implemented https://github.com/cp3-llbb/CommonTools/pull/118#issuecomment-254189417. You must now use include_directories to specify the include directories, and headers to specify the new header to include.

TODO:

• [x] Print of the histograms / plots, headers and stuff like that is missing.

Closes #118

[swertz]

And I'll try to validate at some point unless someone has things ready to do it before...

[blinkseb]

PR updated with fixes!

[blinkseb]

As discussed IRL, I updated the PR to also add support for libraries and library_directories, making #118 obsolete. It worked as expected during my tests.

[swertz]

Many thanks! I'll do an extra test run on condor tomorrow just in case ;)

[swertz]

All good! Thanks again!