Changed from toString() of AssignedSessionVariable object to use getValue() to extract boolean.

Jars correspond to changeset https://bitbucket.org/nrg/uploadassistant/commits/997001956cd05c954dc7301634a985e65d6567d3.
XNAT-3383: Remove system out call
XNAT-1427 Small text change to pipeline configuration page.
XNAT-3345:Placeholder menu item remains when Upload actions are banned or unavailable