Annotated lib/posix/

2016-12-06 Paul Boddie Moved native I/O function usage to functions in the module, employing these functions in the built-in file object. Added the raising of IOError in native functions. Added a tentative read native function implementation. Added a tentative fdopen native function implementation and a miscellaneous datavalue member to the __attr structure. Moved the read function into the module. Temporarily removed imports from the posix top-level module.
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#!/usr/bin/env python
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"POSIX support package."
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