* Fixed unfree'd 'char *results' in all tcl_* functions (only unfree'd in
  certain cases, moved the free to the actual function) so no more mem
  leaks. Tested this with over 500,000 access's for testing :)
* Miscellaneous source style and tabulation fixes

Slight adaption of concurrency-test to enable even more writers/readers.

  correctness of locking schemas in backends.
In back-bdb2 open NEXTID during startup and close at shutdown.

slapd server timing via a new slapd command line option '-t'.

Fix of a back-bdb2 --> back-ldbm leakage (==> new bdb2-specific DB file suffix).

Fix library/include paths for building "Release".
Create getpass() from ud's mygetpass().

I rather have NOID printed as "-1".  It it could argued that ID
should be signed.

cache_set_state() and state args are no history.
Move cache_entry_cmp() and friends to slapd/entry.c to allow sharing
of functions between backends..  Renamed to entry_cmp().

The new e_private field can be used for any backend purpose.  In LDBM,
it's used to point th the private entry info struct.  The LDBM entry
info struct is only visible to the LDBM cache.
WARNING: This change has not be ported to other backends!  Breakage is likely.

Provision for a bdb2 backend-specific DB file suffix.
Fix of the double-open of backend types.

dn rewriting to frontend dn.c function.

the backend type info structure.  Use this filed to control open
and close such that backend's without databases are skipped.

tm_year being 100+.

instead of AC_CHECK_FUNCS() as symbol may be mangled.