Fixed bug in documentation for WholeMolecules

Action::registerKeywords and ActionPilot::registerKeywords were
not called in WholeMolecules::registerKeywords

(cherry picked from commit 53a5b885e1a507cadd1f7ae72b73c3ab1430453a)
Added WRAPAROUND
regtest for WRAPAROUND
Merge branch 'v2.1-wraparound'
changelog