[Proj] Cct, proj_create_crs_to_crs and towgs84 parameters

[Thomas Knudsen]

Hello Olli,

Thanks for testing and reporting! Your report probably relates to a bug
which has been fixed
in pull request #793 over at https://github.com/OSGeo/proj.4/pull/793

Unfortunately, the build fails, due to something which *may* be a bug in
cppcheck (the code
compiles cleanly on all platforms, but cppcheck reports a syntax error).
I'll have to look into
this before merging the PR.

Running locally, my current build reports the following on your test
material:

$ echo 3500000 6650000 0 | bin\Debug\cs2cs_d +init=epsg:2393 +to
+init=epsg:3879
25611546.42     6651551.63 25.30

$ echo 3500000 6650000 0 | bin\Debug\cct_d -t0 +proj=pipeline +step
+init=epsg:2393 +inv +step +init=epsg:3879
25611546.4190   6651551.6301       25.2952        0.0000

/Thomas
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