r/w locks and thread pools.  Hide internal structures (using
pthread'ish technics).  Place common code in threads.c.  Move
no-thread code to thr_stub.c.  Move thread pool code to tpool.c.
Removed setconcurrency call from initializer, added 'concurrency'
directive to slapd.  Tested code under pthreads, pth, and no-threads.

Updated NT Project files (with Cyrus SASL library depend)

Add subtype/subclassing tests to test suite project

Move about and clarify other projects

SLAPD internals
	rootdse,cn=schema compare
	rootdse user configurable attributes (cn,description,seeAlso,etc)

Add ber_get_enum() for symmetry

Need to add lber-types(3) to document BER types, allocation, and deallocation.
May need to add additional pages to document other new features.

Submitted by Gabor Gombas <gombasg@inf.elte.hu>