Expanded the loop_time function to optional take the offset and dispersion point as input for restricting looping.
Regarding bug #21665, (https://gna.org/bugs/?21665) - Running a CPMG analysis with two fields at two delay times.
This is implemented as suggested in: https://mail.gna.org/public/relax-devel/2014-02/msg00143.html
Authored by: tlinnet 2014-02-24
Parent: [r22291]
Child: [r22293]
