that makes full use of libes.a.
The user guide is in Lesson4 of the tutorial - programmer's guide
will come later.
Plus many small changes here and there
Changed es.h in src/es into make_es.h (was ambiguous with src/es.h)
Changed the interface of make_genotype - now templatized by the EOT
and not the fitness - this is mandatory for ES genoptypes as it allows to
choose the type of gentype at run-time (from existing types, of course!)
Also moved make_help.cpp into utils dir (otherwise you'd had to maintain
a copy into each representation dir!).
