Need an API to be able to control the PyTables file object, in case you don't want to save to disk

[aijoe-mcarthyfinch]

I have a use-case where I don't want to save the resulting HDF5 data to local disk. Rather, I want to handle the produced data with a stream pattern.

In my specific case, this is so I can save the HDF5 data directly to an AWS S3 bucket in a resource-efficient way, but I imaging there are other situations where people may want to have control of the file handle. It would be good to have an extended API which supports this.