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
Also: introducing eoRndGenerators.h for eoRndGenerator derived classes:
eoNormalGenerator
eoUniformGenerator
eoBooleanGenerator
eoNegExpGenerator
Note the suffix that are added to aid in determining what these classes do
Also added "using eo::rng" in eoRNG.h so nothing has to be modified.
We should gradually move to write eo::rng everywhere, and remove that using
directive to be almost full-proofed against possible name collision.