Cosmetic improvement of the exponential notation

[blokhin]

i.e. calc_setup['parameters']['crystal']['scf']['fock_mixing'] = {'BROYDEN': [0.00001, 85, 2]} gives 1e-05 in the input file (expected verbatim 0.00001)

[ansobolev]

Doesn't CRYSTAL understand 1e-05?

[blokhin]

@ansobolev it does! Just reads ugly.