Changes for Net::Z3950 module, version 0.50

Changes between versions 0.49 and 0.50 (Wed Jul 27 13:28:03 BST 2005):

• Correct the ResultSet::present() fix that was supposed to be in the previous release: that code inadvertently always returned undef in asynchronous mode.
• ywpriv.h now #undefines list, which the Perl development header files inexplicably and inexcusably #define to Perl_list.
• ywpriv.h now #undefines open, which Solaris 9 #defines (I really can't believe this) to open64. Maybe Sun would like me to go round their place and dump a load of my crap in their workspace?
• New querytype cql can be used to pass CQL queries, untranslated, straight through to the server. Use like:

  	 $conn->search(cql => "au=(kernighan and richie)")