Update to 3.0.50:

--- 3.0.50 2009/11/02

Add support for extra request / response data for SRU codecs and GFS.
The Z_SRW_PDU structure has two new members extraResponseData_{buf,len}
for extra data response buffer and length. For the GFS, both request
and response data (XML) is carried in extra_args and extra_response_data
for the search handler. Patch by Ko van der Sloot.

ZOOM: For queries that cannot be converted to the specified rpnCharset,
ZOOM now returns a diagnostic on the client-side ('invalid query' /
10010).  This fixes bug #2113.

yaz-client fix: If cmdfile is passed to yaz-client (option -f) and that
cmdfile included a 'quit' command that would result in a memory violation.

(wiz)