[Chicken-hackers] [PATCH] Introduce XDG directories

[kooda]

Hi!

We discussed this at CHICKEN Longboat, and even made a ticket:
https://bugs.call-cc.org/ticket/1455

This patch is about using the XDG spec for configuration and cache
directories (XDG_CONFIG_HOME and XDG_CACHE_HOME
environment variables).

It introduces two new procedures in chicken.platform:
system-config-directory and system-cache-directory, as well as make the
following changes in behaviour:

- csi now loads $XDG_CONFIG_HOME/chicken/csirc and falls back to
  $HOME/.csirc if it’s not found

- chicken-install now tries to load an user-defined setup.defauts in
  $XDG_CONFIG_HOME/chicken/setup.defaults (with fallback
  to the one installed with CHICKEN) and puts it cache in
  $XDG_CACHE_HOME/chicken-install/

Man pages are also updated to list the files each program uses.

0001-Introduce-XDG-directories.patch
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