Add flag to matching rules to indicate if DN folding is needed.
Don't specify dnPretty as pretty function for DN attribute types as
this works too well (it breaks tests).

treated as a request for all required and allowed attributes of the class.
This allows:
	ldapsearch (objectClass=*) inetOrgPerson
	(requests return of all attributes of inetOrgPerson)
and
	ldapsearch (objectClass=*) extensibleObject
	(requests return of all attributes, e.g., "+" "*")

Misc schema updates

A pretty routine may rewrite the representation of a value but
must not alter the value itself.

another step towards schema aware normalization: ava sorting in rdns; now by defining USE_LDAP_DN_PARSING both the new dn parsing and the server side normalization is used. There might be, every now and then, a flaw mostly due to naive normalization of pseudo-dn (thinking about some acl/regex stuff and so)

Fixes errors in prior commits.

instead of just one.

"subtypes" and "lang" default behavior.