INSTALL: Added description how to create additional dove* user/group. `doveauth' user and group for the authentication process and the group `dovemail' for mail related Dovecot processes.

# use glob syntax.
syntax: glob

*~
*.py?
.*.swp
.swp
doc/build
build
debian/vmm
debian/*.log
debian/*.debhelper
debian/files
debian/*substvars
.pc
*.egg-info