VanderWoude; this value is retained as a convenience to the user and not used
by anything in the module; if changed externally it may be convenient to keep
this copy up to date.
writing the size of the statement cache size. This parameter can make a huge
difference with the length of time taken to prepare statements. Added support
for setting the statement tag when preparing a statement. Both of these were
requested by Bjorn Sandberg who also provided an initial patch. Cleaned up some
error context strings as well.
