Temporary fix for user-friendly error feedback

Currently, transmart-ui buries any end-user relevant error messages
underneath a layer of technical information. This feature forwards
several of these errors through the plot output. This feature was
already present, and has now been extendend. Should be replaced by
better error handling as discussed in ticket HYVE-12.
:fish:

Whitespace and other code formatting cleanup
Merge commit '94ced52634c5b8a133af72688f53520681af55c4' into issues/UAT-149-HMDB-PRIVATE-row-labels-unclear
Changed several analyses to ignore PRIVATE annotation

When biomarkers do not have an entry in the ontology database
(dictionary), it is replaced by the value PRIVATE. These should not
be concatenated into the label-strings, which is what this commit
corrects.