Allow pulsar distances to be extracted from .par files rather than using ATNF values
The script to generate summary results pages relies on distances for all pulsars being available on the ATNF pulsar catalogue. However, it is useful to be able to manually supply these values instead. This MR allows you to add a DIST
value (in kpc) into the .par
files used by the analysis and that value will be the default distances that is used for subsequent calculations.