bruker_spc: change reading of the SPC file
bruker_spc: change reading of the SPC file

- the extension can be either PAR or par
- lines are separated by \r (std::getline on Linux doesn't recognize it
  as linebreak by default)
- just in case - check that there is no \n in the value

wojdyr/xylib,wojdyr/xylib,wojdyr/xylib