guile licensing niglets

[Neil Jerram <neil@ossau.uklinux.net>]

I've just received some queries about Guile's licensing from the FSF
folks.  I think all of the following are just oversights, but if
anyone else has any input on them, please follow up.

> [..] under the impression that Guile had switched completely to
> LGPL to 1.8, instead of GPL + exception.
>
> However, a few files in 1.8.3 (I admit I didn't check the dev sources)
> still have the exception text.  My grep for special.exception turned up:
> libguile.h
> libguile/__scm.h
> libguile/_scm.h
> libguile/weaks.c
> srfi/srfi-39.scm
> doc/oldfmt.c

I believe these are oversights, so would propose to update the license
text in these files to LGPL.

> Also, there is a COPYING file in many of the subdirectories.  This is
> rather unusual.  One copy for the distribution would be sufficient.

I propose to remove the non-top-level ones.

> Also, the recommended name for the top-level COPYING.LIB is now
> COPYING.LESSER.

I propose to make this name change.

Any comments?

Regards,
        Neil