Converted to use IDL version of original fortran defringing code. New routine is dfringe .pro. The data are passed to this routine via the arguments, rather than via the file ffsubin.dat. Removed use of ffitin.dat file containing initial parameters. Parameters used for input to dfringe routine are written to display.
Period is updated with period found by dfringe routine.
SJU Fixed a bug in the fringe structure - where tunits were not recognised due to order of data tags.