Merge branch 'V5-5-patches' into V5-6-patches

* V5-5-patches:
  CHANGES: snmplib: Rename memdup() into netsnmp_memdup()

Conflicts:
	agent/helpers/old_api.c
	agent/helpers/table_dataset.c
	include/net-snmp/library/tools.h
	man/netsnmp_util.3
	snmplib/snmptsm.c
	snmplib/snmpusm.c
	win32/libsnmp_dll/libsnmp.def