Support for the UserInformation DPU OCLC-UserInformation:

Support for the UserInformation DPU OCLC-UserInformation:
	- Add VAL_OCLCUI to oid.h
	- #include <yaz/z-oclcui.h> in include/yaz/proto.h
	- #define Z_External_OCLCUserInfo in include/yaz/prt-ext.h
	- Add Z_OCLC_UserInformation *oclc branch to Z_External.u
	- Add "OCLC-userInfo" entry to OID database in util/oid.c
	- New file "oclcui.asn" in z39.50 directory
	- Mention "oclcui.asn" and "z-oclcui.c" in z39.50/Makefile.am
	- Add VAL_OCLCUI registration in z39.50/prt-ext.c
	- Add arm to union-database in Z_External() in z39.50/prt-ext.c
	- Include UserInfoFormat-oclcUserInformation in z39.50/z.tcl
	(This is a handy checklist next time I need to add something.)
More verbose authentication-setting in command-line client.
Temporary debugging code in client (for OCLC diagnostics).