r.unpack allows unpacking raster maps packed by r.pack.
NOTES
Name of the raster map is determined by default from pack file
internals. Optionally the name can be given by output parameter.
Currently only 2D raster maps are supported.
Original Bash script written by Hamish Bowman, Otago University, New Zealand as GRASS AddOns
Converted to Python and updated for GRASS 7 by Martin Landa, CTU in Prague, Czech Republic