vmm.cfg: renamed maildir.folders to mailbox.folders. maildir.name was removed. new: mailbox.format, in order to support all mailbox formats from Dovecot. Maildir is the default format. Adjusted VirtualMailManager/Config and update_config.py to the changes mentioned above.

# use glob syntax.
syntax: glob

*~
*.py?
.*.swp
.swp
doc/build