branch feature/completions-highlight-modifications created (now ff46a8f)

[Jimmy Aguilar Mena]

ergus pushed a change to branch feature/completions-highlight-modifications.

        at  ff46a8f   Add backtab commands.

This branch includes the following new commits:

       new  c6a25d8   Insert some modifications to implement completions 
highlighting.
       new  f132cc3   Document the changes in the API for Completions.
       new  8f3e475   Add completions-highlight-mode initial implementation.
       new  a6e73e8   Fix initial comment in completions-highlight file.
       new  d812e76   Improve keymap handling.
       new  8647012   Fix recursive set-keymap-parent in completions-highlight.
       new  71f60b6   Fix corner case when going out of bounds
       new  8a60d7d   Simplify numeric argument
       new  f3ad5c1   Simplify setting keymaps.
       new  a686211   Simplify overlay handling
       new  cb02cb6   Add autoload decorator.
       new  bfe4747   Add parent maps
       new  d397d2b   Add # to function bindings
       new  34570e1   Improve completions-highlight description in file header.
       new  9fe2441   Add custom variable completions-highlight-autoselect.
       new  ac93fdb   Define completions-highlight face and group
       new  6db2c4a   Simplify and rely more in the post-command-hook
       new  ff46a8f   Add backtab commands.