Make us follow the newly documented pathname processing rules:

Make us follow the newly documented pathname processing rules:
"As a special case for directories with large numbers of files, if the
case options are set as follows, "case sensitive = yes", "case
preserve = no", "short preserve case = no" then the "default case"
option will be applied and will modify all filenames sent from the
client
when accessing this share."
This is needed as fixing the case preserve rules to only apply to
new filenames broke the large directory fix. Glad we caught this
before release. Thanks to jht for this one.
Jeremy.