adjust for PROJ6

- Convert lowercase epsg to uppercase EPSG
- Axis order of a CRS is no longer always easting, northing, it can also be northing, easting, e.g. EPSG:4326. If source and target CRS are available, axis order is adjusted using proj_normalize_for_visualization() to easting, northing if needed.
- Previously, GRASS did conversions of degress to/from radians and meters from/to map units. Now PROJ6+ might do these conversions itself, or not. GRASS is now doing the conversions only if needed.
- In PROJ6+, there can be several different operations to transform coordinates from one CRS to another CRS. If more than one operation is available, information is provided about these different operations and the user has to provide one of these as pipeline option to r.proj or v.proj. That means that automated reprojection on the fly with r.import or v.import no longer works if more than one operation is available. Further on, the user must take care about axis order and remove any axisswap step from the pipeline if needed.

support PROJ6, use area to select appropriate operation

use proj_normalize_for_visualization() for operations

support for PROJ6 continued

fix typos
fix debug level