[GRASS-dev] PROJ6 support in GRASS

[Markus Metz]

Hi all,

there is a new PR for PROJ6 support in GRASS
https://github.com/OSGeo/grass/pull/118

There are two important changes when using PROJ6:

First, reprojection with v.proj and r.proj is no longer always possible
without the user making informed decisions. The reason is that there can be
several different operations available to reproject coordinates from one
CRS to another CRS. These different operations are listed and the user has
to provide the appropriate operation with the pipeline option, taking care
of any axisswap.

Second, axis order is no longer always easting, northing, e.g. for
EPSG:4326 it is northing, easting, and an axisswap might need to be removed
from operations provided by PROJ.

There are many more changes (see details in the PR), but these are the two
most important ones.

Feedback welcome!
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