lexer change

[Boris 'pi' Piwinger]

David Relson wrote:

> 2 - acceptance of digits at the beginning of tokens and acceptance of
> numbers as tokens
> 
>     Rejected.  I don't see value in this change.

Here are my personal results. I have *lots* of those tokens
(4806), only 11 of which are significant (all hammish).

I have 141 of the numeric-starting tokens with subj:, of
which only 1 is significant.

So this is enough for me to accept that those are not
helpful. It is a suprise to me.

I do see a lot starting with 3D (which is = in
quoted-printable). So I'll have to investigate if there is a
problem. Not today.

pi