adding ideas for tutorial
clean up symbolic regression example
Merge branch 'master' of github.com:Ambrosys/gpcxx
starting with symbolic regression tutorial
more ideas for tutorial
Merge branch 'master' of https://github.com/Ambrosys/gpcxx into gerard/example

Conflicts:
	doc/gpcxx.qbk
	include/gpcxx/config_version.hpp
Documentation so far, without profreading,