missense_variant features propagated via Ensembl onto Uniprot not being automatically coloured red and displayed

Original problem that spawned JAL-3330.

In default Jalview install, retrieve a uniprot sequence and show Ensembl cross-references. The CDS/Protein view will not show missense variants, and inspecting feature settings shows missense variants have their string-based default colour of magenta.

Problem tracked down to USE_FULL_SO=false by default. Solution is to switch to by default using USE_FULL_SO=true.