ldif updates (add URL description).

Remove man pages for old ldbm tools.

New id2entry (id-less) format (ldbm/bdb2)
Removed id2children (ldbm/bdb2)
Added nextid database (ldbm)
Broke ldbmtest
Removed ldif2* tools (ldbm/bdb2)
Added slap tools (slapadd, slapcat, slapindex)

loadable modules. Gratuitously renamed "loadmodule" to "moduleload".
"modulepath" takes a single argument, a colon-separated list of absolute
pathnames.

	for inet_aton().  May be linked in when not absolutely necessary...
	but no big deal, we'll likely start using res_search over sychronous
	get{host,peer}byname calls anyways.
inet_aton() detection: use link instead of compile

of each rule!

Minor schema file cleanup