- Improved the function `photometric_fitting' by

  1) providing the option to extract the (internal) value of the qualifier `norm_chi_red',
  2) adding a do-while loop to ensure that the confidence level search really starts at chi^2_reduced = 1 if the qualifier `norm_chi_red' is set,
  3) adding a grid safety check.
- Changed some labels and the behavior of the qualifier `factor' in the function `xfig_photometry'.
- Fixed a small bug in the function `syn_spec' causing incorrect warnings.
- Updated the file `templates/photometry.sl'.