XML output functions

I started converting xml_output.c to use the svn_make_tag_* interfaces
you envisioned, and determined that svn_append_tag_* (which appends to
an existing string instead of making a new one) would wind up being
noticeably more readable.

I looked at the libsvn_wc code a little, and I think you'll also find
it more convenient to have append functions there.

Anyway, I can still do svn_make_tag_* if you prefer, but I think this
will turn out better.
Received on Sat Oct 21 14:36:10 2006