Fix large file allocation for 32 bit unix - #29
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File allocations over 2Gb that use the
allocatemethod currently fail on 32 bit unix aslibc::off_tis defined as 32 bit. Usingposix_fallocate64with alibc::off64_tfixes it.The test requires that your tempdir has at least 2Gb free and can support files that are 2Gb in size. Not sure this is a great requirement, but not sure how else to test it.