[Nmh-workers] Some small changes being checked in for anno

[Jon Steinhart]

I feel (slightly) bad about making these changes while I'm trying
to get out a release, but here goes anyway.  I've made the following
changes to anno:

 o  Fixed a bug where anno -append put the headers in the wrong place
    if applied to a message that didn't contain any headers.

 o  Added a special value of "all" to the -number option that causes
    anno -delete to delete all matching components instead of just
    the first one.

 o  Added new -preserve and -nopreserve options.  Using -preserve
    retains the original last accessed and last modified times on
    annotated messages.

Jon