Added unit test for find_intensity_keys() in R1rho analysis.
Regarding bug #21344, (https://gna.org/bugs/index.php?21344) - Handling of in sparse acquired R1rho dataset with missing combinations of time and spin-lock field strengths.
Authored by: tlinnet 2014-02-26
Parent: [r22346]
Child: [r22348]
