[OSRS-PROJ] Swiss projections

[Gerald I. Evenden]

I finally have scrounged enough info from the net that pretty
well verifies that the projection known on the PROJ system
as somerc will do the CH1903 and CH1903+ grid systems. It also
appears that this projection was originally done by Rosenmund
with inferences that it may be what is called the "Rosenmund
Projection."

This latter interpretation is still not verified.  The projection
uses our old friend from the Krovak and alternate stereographic:
conformal projection to the sphere now known as pj_gauss in the
modern libproj library.


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