[GRASS5] 5.7: make GRASS_INT_ZLIB default?

[Markus Neteler]

Hi,

proposal for 5.7-CVS: make zlib compression instead of RLE the
default setting, probably modifying:

grass57/lib/gis > grep GRASS_INT_ZLIB *
opencell.c:     COMPRESSION_TYPE = getenv("GRASS_INT_ZLIB") ? 2 : 1;

Are there objections?
I am, however, not sure, how to apply such change (without
breaking things).

Markus