proj strings with +type=crs and EPSG codes are not handled

[namdre]

So far or projection handling only seems to work for projection type 22 ( OTHER_COORDINATE_OPERATION)
I couldn't figure out how to call proj_trans with any projection of type 15 (PROJECTED_CRS)
See https://proj.org/development/reference/datatypes.html#c.PJ_TYPE

Possibly we should be using proj_create_crs_to_crs (OSGeo/PROJ#2087)
This would require making the input CRS explicit (currently, netconvert assumes WGS84)

The following works:
--proj.utm:
--proj "+proj=utm +zone=32 +ellps=WGS84 +datum=WGS84 +units=m +no_defs"
--proj "+proj=utm +zone=32 +datum=WGS84 +units=m +no_defs"

This doesn't work:
--proj "+proj=utm +zone=32 +datum=WGS84 +units=m +no_defs +type=crs"
--proj "EPSG:32632"

This is what the PRO documentation has to say about this topic:

If a proj-string contains a +type=crs option, then it is interpreted as a CRS definition. In particular geographic CRS are assumed to have axis in the longitude, latitude order and with degree angular unit. The use of proj-string to describe a CRS is discouraged. It is a legacy means of conveying CRS descriptions: use of object codes (EPSG:XXXX typically) or WKT description is recommended for better expressivity.

If a proj-string does not contain +type=crs, then it is interpreted as a coordination operation / transformation.