AW: [MERGE] ``BZR_LOG=disable`` suppresses writing messages to.bzr.log.

[Voelker, Bernhard]

> I agree on all points. I wasn't sure what was best. Maybe "BZR_LOG=''"

> to indicate that it should not have a log file. I'm not a big fan of 
> having an empty env variable mean something different than one with a
value.

what about this?

In good old UNIX tradition:
	BZR_LOG=/dev/null
or on Win32:
	set BZR_LOG=nul

Have a nice day,
Berny