[PROJ] Emulating CalCOFI pseudo-projection

[Dan Jacobson]

Reading https://proj.org/en/9.2/operations/projections/calcofi.html I
became curious if I could emulate it using cs2cs, or other projections,
like:

> The coordinate system is based on the Mercator projection with units
> rotated -30 degrees from the meridian so that they are oriented with the
+proj=omerc +alpha=-30
> coastline of the Southern California Bight and Baja California. Lines
> increase from Northwest to Southeast. A unit of line is 12 nautical miles.
+units=kmi +k_0=.083333
> Stations increase from inshore to offshore. A unit of station is
> equal to 4 nautical miles.
+units=kmi +k_0=.25 #for a second run
> The rotation point is located at line 80, station 60,
+x_0=80 +y_0=60
> or 34.15 degrees N, 121.15 degrees W,
+lonc=-121.15 +lat_0=34.15

Alas, if it were that simple, someone would have mentioned it on
https://github.com/OSGeo/PROJ/issues/135 .