Creates a directory including any necessary but nonexistent parent directories.
TRUE if the directory was successfully created,
Note that if the directory already exists,
FALSE is returned.
On very rare occasions, we have observed on a large shared file
system that if one tests for the existence of a directory immediately
after creating it with
dir.create(), it may appear not
to be created. We believe this is due to the fact that there is a
short delay between creating a directory and that information being
fully propagated on the file system. To minimize the risk for such
false assertions on "slow" file systems, this method tries to create
a missing directory multiple times (argument
waiting a short period of time between each round) before giving up.
dir.create() is used.
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