Enhancement: Replace CookieAuthFileGroupReadable option with flag for CookieAuthFile

Making Tor's cookie auth file group-readable currently requires the use of two separate options:

# (1) Current (as of Tor 0.3.0.10) and unwieldy
CookieAuthFile /path/to/file
CookieAuthFileGroupReadable 1

I suggest to replace the option CookieAuthFileGroupReadable with a flag GroupReadable for the CookieAuthFile option:

# (2) Feature request: GroupReadable flag, replaces (1)
CookieAuthFile /path/to/file GroupReadable

This enhancement would feel more "natural" and is consistent with a similar flag for the ControlPort option:

# (3) Current (as of Tor 0.3.0.10) and natural:
ControlPort unix:/path/to/socket GroupWritable

Trac:
Username: Ralph