bm23 feedback

• feedbacks on preedge:
  • plots of pre_edge and post_edge seems to provide the same curve. Is it a display issue or something else ? should be fixed from online
  • insure parameters are explains somewhere: with tooltip or from an interrogataion mark. Is a tooltip enought ?
  • add plot of spectrum.flatten_mu
  • autobk and rbkg should be floating and not integers
  • rename exponent to nvict factor (give link to the original parameter name)
• autobk: replace the spectrum plot by the normalized mu
• xrcf
  • replace k_max by percentage. k_min to 3. K can be get from previous computing.
  • k_min and k_max must be floats
• kweight is present in xfcf and autobk but are two differentes elements. Precisions should be provided for it.