url-encode local branch names

[Marius Kruger]

I need to have branch names like 1.2/1.2.2
but when I wanted to pfetch these branches it said:
# Creating local branch 1.2/1.2.2...
bzr: ERROR: Parent directory of file:///stuph/projects/vps-cas/src/.scmproj/repos/dbobjects/1.2/1.2.2 does not exist.
You may supply --create-prefix to create all leading parent directories.

We can encode the local dir name with urllib.quote
    then we would have to make sure everything which interacts with the repos does this consistently.

[Alexander Belchenko (bialix)]

I think we need encode many types of names, not forget about special windows names like 'aux', 'com' etc.