"svn propset --help" should document svn:special

I wasn't paying attention when svn:special was introduced, but all
the other "magic" properties are documented in the propset help text.

The implementation has problems. I can set svn:special on an ordinary
file and commit it, but post-commit processing fails

$ touch wc/zig
$ svn add wc/zig
$ svn ps svn:special \* wc/zig
$ svn ci wc -m ""
svn: Commit succeeded, but other errors follow:
../svn/subversion/libsvn_client/commit.c:790: (apr_err=155009)
svn: Error bumping revisions post-commit (details follow):
../svn/subversion/libsvn_wc/log.c:329: (apr_err=155009)
svn: In directory '/home/pm/sw/subversion/obj/wc'
../svn/subversion/libsvn_wc/log.c:1239: (apr_err=155009)
svn: Error processing command 'committed' in '/home/pm/sw/subversion/obj/wc'
../svn/subversion/libsvn_wc/log.c:1009: (apr_err=155009)
svn: Error replacing text-base of 'zig'
../svn/subversion/libsvn_subr/subst.c:839: (apr_err=200007)
svn: Unsupported special file type ''
../svn/subversion/clients/cmdline/util.c:351: (apr_err=200000)
svn: Your commit message was left in a temporary file:
../svn/subversion/clients/cmdline/util.c:352: (apr_err=200000)
svn: '/home/pm/sw/subversion/obj/wc/svn-commit.tmp'

If I then try to checkout/update I get

../svn/subversion/libsvn_wc/log.c:329: (apr_err=155009)
svn: In directory 'wc'
../svn/subversion/libsvn_subr/subst.c:839: (apr_err=200007)
svn: Unsupported special file type ''
$ svn st wc
! L wc

and cleanup fails.

-- 
Philip Martin
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