Added Relax Error, if less than 2 time points is used for exponential curve fitting in R2eff.
This follows:
http://thread.gmane.org/gmane.science.nmr.relax.user/1718 http://thread.gmane.org/gmane.science.nmr.relax.user/1735
Specifically, data was attached here: http://thread.gmane.org/gmane.science.nmr.relax.user/1735/focus=1736
Authored by: tlinnet 2014-08-29
Parent: [r25417]
Child: [r25419]
