Fix for bug #20683 (https://gna.org/bugs/?20683) - the infinite and NaN data in Bruker DC files.
This was reported by Mengjun Xue <mengjun dott xue att mailbox dott tu-berlin dot de>.
The model-free specific overfit_deselect() method now checks for infinite relaxation data and deselects the spin if such data is encountered.
Authored by: bugman 2013-04-02
Parent: [r19301]
Child: [r19303]
