Make kwdemo less verbose
1) Set the branchname always silently with
dirstate.setbranch().
We create a branch so that testing the {branches} template
does not come up empty. But kwdemo is hardly the place to
inform the user by inference why {branches} is empty on the
default branch.
"demobranch" is ascii and cannot be changed, so using the
internal command instead of commands.branch() is safe.
2) Do not show full path to temporary directory
(distracting long lines on Mac OS X).
3) No special debug output. Output only related to keyword,
no internals like unsetting of commit hooks etc.
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