Added system test for R1rho, using calc().
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.
This system test will currently fail.
Authored by: tlinnet 2014-02-28
Parent: [r22379]
Child: [r22381]
