Rename all new public stream symbols to start with 'svn_stream_' so that all of the stream symbols are in the same name space except for some old ones such as 'svn_read_fn_t'. Some or all of these might soon be renamed again to make them private, but that is a separate issue.
* subversion/include/svn_io.h, subversion/libsvn_subr/stream.c (svn_skip_fn_t): Rename to svn_stream_skip_fn_t. (svn_io_mark_fn_t): Rename to svn_stream_mark_fn_t. (svn_io_seek_fn_t): Rename to svn_stream_seek_fn_t. (svn_io_is_buffered_fn_t): Rename to svn_stream_is_buffered_fn_t. (svn_stream_t, svn_stream_set_skip, svn_stream_set_mark, svn_stream_set_seek, svn_stream_set_is_buffered): Adjust uses of the same.