cogito-0.18rc2

Cogito-0.18rc2. (Enough of the silly wannabe-funny verbs.)

This is mostly random bugfixing of 0.18rc1 (check out its announcement if
you don't know about the cool new features yet), with few minor new
features.  I originally wanted to have cg-clone -a support in 0.18 but it
has so many goodies that I will release it ASAP and hopefully 0.19 will not
take so long anymore. If no big bugs show up until Wednesday or so, I will
release 0.18 so that this finally gets its way to wider audience.

It contains all the bugfixes from 0.17.4, some more master-specific
bugfixes (if you are using 0.18rc1, upgrade), and most notably:

* INCOMPATIBLE: cg-log now by default hides merges, -M behaviour is
  reversed
* All kinds of very stale command aliases that were deprecated for eons
  were removed
* .git/author is deprecated (use .git/config to set it up)
* We now officially depend on 1.4.2 (we use git-*-fetch --stdin which makes
  fetching tags _MUCH_ faster)

* cg-clone -l now sets up an alternate instead of symlinking the object db
* Support for cg-clone --reference
* cg-admin-setuprepo supports setting up repositories over SSH
* Support fetching over FTP

* Start of some work on making Cogito compatible with POSIX sh (didn't
  get much far for now) and depends less on Perl for now (didn't get
  much far either ;)
* Start of an effort to document Cogito hooks

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