bash support for XDG Base Directory spec (~/.config/bash/)

[Allison Karlitskaya]

hello,

Please consider these two patches for inclusion in bash to support
storing shell initialisation files (profile, bashrc) in a subdirectory
of ~/.config/ as most programs do these days.

I'm happy to make changes to address any feedback.

Even if you'd prefer not to apply the second patch, applying the first
patch is a nice cleanup and would make it easier for distributions
such as Fedora to apply the second patch for themselves.

Thank you very much for your consideration,

Allison

0002-shell-add-.config-bash-startup-script-options.patch
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0001-shell-reduce-duplication-with-startup-files.patch
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