spherical f functions

Spherical f-functions have been tested with gaussian fchk files.
See f-only.fchk and f-only.cube in avogadrodata. Qube will generate
cube files that are of opposite phase to the cube files in avogadrodata.

Change-Id: I9a9ed7fc520adb3c87ef76a00e1f2c010e91b90d
Missed two breaks in GaussianSetTools::calculateValues

Gaussian FCHK files should now work.

Change-Id: Id24c3009adba69f4118f64c449f23c97de48f27b
Merge topic 'f-functions' into master

9c6f76a3 Missed two breaks in GaussianSetTools::calculateValues
c68b61ca spherical f functions