Implemented systemtest: test_bug_negative_intensities_cpmg, to show lack of error message to user.
Maybe these spins should be de-selected, or at least show a better warning.
task #7822(https://gna.org/task/index.php?7822): Implement user function to estimate R2eff and associated errors for exponential curve fitting.
Authored by: tlinnet 2014-08-29
Parent: [r25435]
Child: [r25437]