improve tamil input method (keys and docstring)

[Kenichi Handa]

I'm now discussing with Jambunathan K
<address@hidden> on the improvement of tamil input
method.  There are two issues; one is to add new keys for
characters that can't be input by the current tamil-itrans
input method, another is to improve the docstring of
tamil-itrans.  Changes for both of them are fairly simple
and safe.  Yidong and Stefan, may I commit that change to
trunk?

Attached is the current version of the patch.  But, for the
improvement of docstring (change to leim/quail/indian.el),
we are now discussing with Jambunathan about the final
result, and thus it may have different form.

---
Kenichi Handa
address@hidden

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