Add close() method and with statement support to InputFile #23
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Fixing two minor annoyances with the library :)
(1) The addition of the close() method allows to programmatically close an open .exr without waiting until the program completion. I often find myself being prevented to operate on files because of dangling, open file descriptors.
(2) The "with" statement support allows to write such as:
which closes the open file whatever happens (e.g. should an exception happen).