Improve hg-ssh script, give it some acl support

[kiorky]

I would like to have svn's like acls support against posix accounts AND groups.
I cannot go with the acl extension as i would like too to give users the right
to clone "none already existing repos" on the server side.

And, of course; giving wide ssh access is excluded.

So i rewrote hg-ssh to take a configuration file as input to know
which acls the user has (read, readwrite, recursive access)

The code is living on a personnal hg repository that you can find there : 
https://hg.cryptelium.net/hg/system/config/hg
and clone with:
hg clone https://hg.cryptelium.net/hg/system/config/hg

The interresting files are in the hg-ssh directory. 
You will find in there the configuration sample and the python ssh wrapper.

For easy reading, i join them to that mail.

(I sent on -devel by error.)

-- 
--
Cordialement,
KiOrKY
GPG Key FingerPrint: 0x1A1194B7681112AF

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[/foo]:
r= someUser @someGroup
rw = toto @toto
options=recursive


[/bar]:
r= someUser @someGroup
rw = toto @toto
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