Fixed a buffer read-overrun in my latest optimisation of
RansDecRenorm().  Now using the original.

Tidy up the bracketting to make gcc happier (no change to compiled
output).

Protected against attempting to do order-1 compressio of data < 4
bytes long. The 4-way unrolling caused this to fail, but it is a
pointless thing to try anyway so it now uses order-0 for that case.


git-svn-id: svn://svn.code.sf.net/p/staden/code/io_lib@3734 ba6f2710-ca9f-427c-89d3-5bf716dbc8e1
Added #define checks for getopt.h, as needed on FreeBSD.

Patch supplied by German Tischler.


git-svn-id: svn://svn.code.sf.net/p/staden/code/io_lib@3735 ba6f2710-ca9f-427c-89d3-5bf716dbc8e1