subtle bug:
micro bug remove in the initialization of the bath from scratch.
The very small value of the hybridization vbath seemed to create
problems to the cg_scheme=weiss fitting procedure, by causing the
minimization to flow to large unphysical value of the parameters.

Fixed by requiring that V is at least 0.1.

Slight update of the ED_CHI2FIT.f90 module, with routines re-naming for
better understanding.
In addition re-use of the fg_delta_xxx function is implemented in the
evaluation of the fg_weiss. This ease the calculation and improve reliability.

introduced a variable ed_verbose to handle the general verbosity level of the ED code.
update: ed_verbose update to different level of verbosity for the ED program.
0 = print all (pedantic-mode; DEFAULT)
1 = print major info: no progress, no impG0
2 = print less info: no impG, no timing, partial fit info
3 = print few info (cow-boy mode): only impSigma and observables from impurity at last loop
4 = print almost nothing (crazy mode): only hamiltonian restart and observables at last loop.

Minor modification in the Chi^2 module following update of the OPTIMIZATION_MINIMIZATION in SciFor.
update: added analytic gradient for the chi^2 fit also in the
Superconducting channel for cg_scheme=delta. Test for Bethe lattice
successful.