bug#15539: Setting user-emacs-directory at command line invocation

[François Févotte]

On Mon, Mar 16, 2015 at 1:36 AM, Glenn Morris <rgm@gnu.org> wrote:
> I'm not saying it's the right solution, but you could use an environment
> variable (eg EMACS_USER_DIRECTORY) rather than a command-line switch to
> control this.

Attached is a new patch implementing this idea. The differences with
respect to the first version are:

1- `user-emacs-directory' is read in the `EMACS_USER_DIRECTORY'
environment variable instead of from the command-line;

2- a few custom variables are declared in
`custom-delayed-init-variables' in order to account for the new value
of `user-emacs-directory'.

Once again, please don't hesitate to comment.

    François

0001-Look-for-an-EMACS_USER_DIRECTORY-environment-variabl.patch
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