Updates for BC/OA

Updates to allow various routines to plot BC (BCPI+BCPO) and OA (OCPI+OCPO
+SOA tracers). Also now have option to plot track over model maps (e.g.
for passive tracers where no obs. value exists).

Signed-off-by: Jenny Fisher <jennyf@uow.edu.au>
Stop tvmap from resetting multipanel
New routine to plot individual components of OA profiles.

Signed-off-by: Jenny Fisher <jennyf@uow.edu.au>