DEVEL15-windows-buffers-20071210

DEVEL15-windows-buffers-20071210

LICENSE MIT

after removing cm_buf_t objects from the hash tables, clear the HT list
pointers to make debugging easier.

when modifying data version values in buf_ForceDataVersion() grab a
read lock on buf_globalLock instead of a write lock.  A write lock is
only required if the hash table linked lists are being modified.
The dataVersion itself is protected by the cm_scache_t mx mutex being
held.

(cherry picked from commit ef5e9a4dd7a4977d7d9f41266f2a0c491720e387)