Changes for Net::Z3950 module, version 0.20

Changes between versions 0.14 and 0.20 (Fri Oct 12 17:12:04 2001):

• Add name() method to the Net::Z3950::Connection class.
• Add the wherewithal for asynchronous operations to invoke callbacks when they complete
• Fix staggeringly stupid bug in which the synchronous search() method would always expect an initResponse, so that you couldn't call search() twice on one connection.
• Add support for the UNIMARC record syntax (required by Bath)
• Remove the stupid and implemented records() method from the Connection class.
• Implement CCL qualifiers, specified in "ccl.qual" file.
• Improve diagnostics from APDU assembly.
• Fix a rather silly bug where records, once fetched, were cached irrespective of their element-set name, so that record fetched as 'b' and then as 'f' would appear brief.
• Revamp the "samples" directory: all examples now work(!)
• Add ZOOM references to the documentation.
• Minor fixes to documentation, comments, etc.

(This major revision - indicated by the increment of the first-decimal-place version number - was largely motivated by the October 2001 ZIG meeting's tutorial, for which I prepared a simple multiplexing client, and was surprised at how hard it turned out to be.)