bug#16002: an improved input method for Esperanto

[Ivan Shmakov]

        As of e7203144, Emacs provides esperanto-postfix and
        esperanto-prefix input methods, which both require the use of up
        to two keystrokes per Esperanto letter.

        A more ergonomic approach is, however, to remap the letters not
        used in Esperanto (q, w, x, y), as well as the square brackets,
        to the “extra” letters needed, like (following the example of
        the ‘epo’ Xkb layout):

⋯✂⋯ C-h I esperanto RET ⋯✂⋯
     +----------------------------------------------------------------+
     | 1! | 2@ | 3# | 4$ | 5% | 6^ | 7& | 8* | 9( | 0) | -_ | =+ | `~ |
     +----------------------------------------------------------------+
       | ŝŜ | ĝĜ | eE | rR | tT | ŭŬ | uU | iI | oO | pP | ĵĴ | ĥĤ |
       +------------------------------------------------------------+
        | aA | sS | dD | fF | gG | hH | jJ | kK | lL | ;: | '" | \| |
        +-----------------------------------------------------------+
          | zZ | ĉĈ | cC | vV | bB | nN | mM | ,< | .> | /? |
          +-------------------------------------------------+
⋯✂⋯ C-h I esperanto RET ⋯✂⋯

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