subdirectories; add explicit dependencies for subdirs that need them.

LDAPext discussions).
Add attrs and attrsonly support to monitor/config info.
Add rdn attributes to schema/monitor/config.
Add extensibleObject objectclass to schema/monitor/config.
Add top objectclass to rootdse/monitor/config.
Remove opattrs option from send_search_entry().

as it's not stored the directory.

all cases (including root dse).

Rework sys_errlist detection to set HAVE_SYS_ERRLIST if sys_errlist
exists.  If it declaration is needed, DECL_SYS_ERRLIST is also set.

of explicit acconfig.h entries.

time, skipping the filter, for instance.  Also, we were parsing
twice the scope and the filter.  I think this change is right,
but could use more eyeballs...

an OID or a proper type string (letter followed by 0 or more
alnum/-).

NULL does not meet basic syntax rules.

  by <who> <access> changed to by <who>+ <access> (joined with AND)
  added peername=<regex> sockname=<regex> url=<regex>
  removed addr=<regex> (use peername instead).
replace dn_upcase with str2upper and str2lower.  Use where needed.

not yet user-settable.  Defaults "on" for now.
Partial support for temporary RSA keys, skeleton for DH.
Add call to X509V3_add_standard_extensions() on init, mod_ssl
does this too, but I am unsure about what it does.
Move management of client CA certificates to a new routine, since
it is going to get more complex than the current code.