Added one more keybinds for readline

  * docs/readline/readline.org: added two new keybinds for readline
    (using them in bash shell): 'C-xe' and 'C-xE', first encloses any
    word-with-hyphens into '$(command -v)' assuming that a word has a
    space at end, the second does the same but expects that a word is
    the last entry on a line;
    - readline/inputrc: refreshed, tangled from Org document;
  * texlive-rsync-servers: comment release server and uncomment pretest
    one.

Signed-off-by: Vladimir Lomov <lomov.vl@gmail.com>