Streamline histogramming

v1.4

Docu update

Lazy functional vector available, uniform histograms filling API

This release is a major step towards performance.
Now, in addition to the functional vector eagerly executing each transformation a lazy version is available.
Replacing wrap with lazy lets you try it out.
Histograms filling API is now removed from functional vectors. It resides now in a separate filling.h header.
You need now to fill the histograms via a call that looks like this: mydata >> HIST1(...) instead of mydata.fill(HIST1(...)).
Also, plain-old-data can be sent to the histogram in this way: double x = ...; x >> HIST1(....).

CMAKE build + some more tests

This release contains now CMake build example and start on tests.

All functionality in place

This version is ready to go