Add bulk aerosols from SAGA. Also add fudge factor to fix underestimate of
AMS aerosol mass caused by a problem with the inlet. This will need to be
revisited later when the AMS team have a better correction.

Signed-off-by: Jenny Fisher <jennyf@uow.edu.au>
Various updates including:
- Allow aerosols to be plotted in ppt (for SOx comparisons)
- Fix units on SO2
- Allow track to be overplotted with no data (oplot_track)
- Allow city locations to be overplotted (currently Atlanta, Birmingham)
- Fix colorbar unit issue for data in pptv
Change colors to match other plots, allow user to pick legend location.
Add selection by latitude, longitude; make window square(ish)
Special cases for OA.

We don't have OCPI, OCPO in timeseries, but we do have SOA tracer. Allow
observed OA to be plotted over modeled BGSOA or total SOA. Also move
tracer-picking code to not interfere with this.
New routine lets user plot observed/modeled profiles plus a 3rd, user-
specified.
Special routines for plotting OA components from model.
Files for flight on 20130823