- Add new function Net::Z3950::ZOOM::query_ccl2rpn(), for

- Add new function Net::Z3950::ZOOM::query_ccl2rpn(), for
	  client-side CCL compilation.
	- Add new ZOOM::Query::CCL2RPN class, encapsulating CCL
	  compiler functionality as a Query subclass.  This allows
	  client-side CCL to be used for both search and scan.
	- Add two new error-codes, CCL_CONFIG and CCL_PARSE,
	  returned by the client-side CCL facilities.
	- Supply a sample CCL profile file: samples/ccl/default.bib,
	  copied from the same-named file distributed with YAZ.
	- The test-scripts t/12-query.t and t/22-query.t are extended
	  to also test client-side CCL searching.
	- The test-scripts t/15-scan.t and t/25-scan.t are extended
	  to also test client-side CCL scanning.
	- Documentation updated to describe use of CCL.