[FEATURE REQUEST] auto insert close paren

Hi,

Ikumi Keita gave me a feature request in Japanese, so I'll try
to summarize and translate his mail.

[request]

When we write open paren `(', automatically close paren `)' is
inserted and cursor is move into inside them.  This should be
worked on similar symbols.

ex.
  (             -> (-!-)
  $             -> $-!-$
  \[            -> \[ -!- \]
  \{            -> \{-!-\}
  \left(        -> \left( -!- \right)
  \bigl(        -> \bigl( -!- \bigr)
  \bigl\langle  -> \bigl\langle -!- \bigr\rangle

`-!-' means a cursor.

Ikumi knew this feature from YaTeX (Yet Anothor TeX
mode|http://www.yatex.org).


Unfortunatelly, I don't have time to write this code.
Volunteers are welcome!

regards,
---
email: [email protected]
Name:: Masayuki Ataka // (Japan)