Add an environment variable approach to disable saving a local file. #58
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The environment variable is `RSERVE_DISABLE_LOCAL_FILE`. If this environment variable is set at compile time, the the `get_file` method of the `Statistics::R::IO::Rserve` package will ignore the `$local` parameter if set, and not save the file to that file name. It will merely return the `$data` retrieved from Rserve. This will be used by WeBWorK and PG to prevent a problem from attempting to save a file outside of the allowed html temporary directory.
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The environment variable is
RSERVE_DISABLE_LOCAL_FILE. If this environment variable is set, the theget_filemethod of theStatistics::R::IO::Rservepackage will ignore the$localparameter if set, and not save the file to that file name. It will merely return the$dataretrieved from Rserve.This will be used by WeBWorK and PG to prevent a problem from attempting to save a file outside of the allowed html temporary directory.