No longer open files in append mode, as this caused bugs when used with pwrite #82
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POSIX requires that opening a file with the O_APPEND flag should have no affect on the location at which pwrite() writes data. However, on Linux, if a file is opened with O_APPEND, pwrite() appends data to the end of the file, regardless of the value of offset.
See https://linux.die.net/man/2/pwrite.