- Documentation can now be built by command 'make doxyuser'
- configured doxy files now in build/doxygen (no longer under version
  control)
- html output now under html/build

- rename flag BORNAGAIN_RELEASE -> BORNAGAIN_CONFIGURE_DOXY
- write configured Doxyfiles to auto/Doxygen

A few more virtual->final, protected->private. Start manual revision (reactivate outcommented sections).

Top-level routines moved from Fit/Suite to Core/Fitting.
Some base classes and utilities moved from Core to Fit/Utils. This requires more thought.

Since RealParameterWrapper now knows its name, ParameterPool needs no longer to use a map: converted to vector, just for conciseness.

new file Fit/FitKernel/AlgorithmNames.h so that Fit no longer depends on Core/Basics/BornAgainNamespace.h

the remaining Doxyfiles write to subdirectories html/std, long, dirgraphs