TODO

The following module commands are NOT implemented in tcltkgrass:
d.measure
d.what.db
db.createdb
db.databases
db.drivers
db.dropdb
db.droptable

i.colors

r.bilinear
r.fill.dir
r.flowmd
r.in.bin
r.out.png
r.line
r.poly
r.timestamp

s.out.e00
s.univar
v.bubble

v.out.dxf
v.surf.rst
v.timestamp

