Make 'svn status' recognize incomplete directories. Also, fix a
buglet related to the new 'incomplete' flags, only now revealed by
'svn status'.
Mauve Bikeshed: show a "!" for incomplete dirs, just like missing
items, so that users realize that 'svn up' needs to be run.
[ People are still arguming, but let's try this out for a little
while. If we come up with a different consensus, or if this causes
disaster/confusion, we can always change it. ]
* libsvn_wc/entries.c, entries.h (svn_wc__entries_init): if 0 or -1 is
passed in as a revnum, then do *not* mark THIS_DIR as incomplete;
it's just a new directory being scheduled for addition.
* libsvn_wc/update_editor.c (close_directory): egads, stop having
close_directory() bump the directory revnum! this is old cruft, no
longer necessary, since the legitimate revnum is already installed
by open_dir() or add_dir().
* libsvn_wc/status.c (assemble_status): notice incompleteness in the
same place we recognize absence.
* svn_wc.h (enum svn_wc_status_kind): new 'incomplete' status enum.
* cmdline/status.c (generate_status_code): show a '!' for incompleteness.
* cmdline/main.c (svn_cl__cmd_table): augment 'svn help' description.
* book/ch03.xml, ch08.xml: update book's description of '!', and what
to do when you see it.
