cvs lstags support

[Alexey M. <al...@hs...>]

hello,

I've almost completed the implementation of 'cvs lstags'.

Two things that are missing now are:

  - locking (but the CVSROOT/val-tags is not lock-protected anyway ;)
    Though this will be done actually.

  - how to properly authorize the 'cvs lstags'?  I think that if the
    user is allowed to access the 'CVSROOT' module, then she must be
    allowed to do 'cvs lstags';

    What do you think?

    The one drawback for this plan is that we do not have the "access"
    module-level permission :) Maybe it's time to think if we need one
    or if could get away with directory-level permissions on
    'CVSROOT/' subdirectory?


I'll do a couple more fixes bit later, and I MUST DOCUMENT THIS I MUST
DOCUMENT THIS I MUST DOCUMENT THIS.

--alexm