Determine peak width

[lpatiny]

@jobo322 could you check why this can not be optimized further ?

[lpatiny]

@hamed-musallam Remove the experimental flag of this feature.

Add an workspace peak option to define the default shape. By default pseudovoigt, with mu 0.5 and fwhm 1 (depending the shape).

Add a button 'Apply to all' in the one peak edition