enable SSE2 on AMD chips as well (K10s gain a little), closes #52
fixed a bug where mzd_apply_p_right would overwrite stuff after ncols
assert offset==0 for png function
start branch where A->offset is always 0

--HG--
branch : nooffset
removed all mentions of A->offset + switched to SSE2 in M4RI

--HG--
branch : nooffset
more cleanup of unused code (wordwrapper.h)

--HG--
branch : nooffset
mzd_row_clear_offset is back (it's needed by Sage)
mzd_submatrix works for arbitrary submatrices again
removed more stuff not needed any more because of A->offset == 0

--HG--
branch : nooffset
use 6 tables by default (it was an oversight to use only 5) in PLE

--HG--
branch : nooffset
removed old comments

--HG--
branch : nooffset
improved PLE base case (faster now for 4096 x 4096)

--HG--
branch : nooffset
adding print_cpu_time function for benchmarketing

--HG--
branch : nooffset
more compact ple_russian code + using 8 tables

--HG--
branch : nooffset
print "cpu time" as well

--HG--
branch : nooffset
adding template.h files (missing from previous commits)

--HG--
branch : nooffset
dropped double const

--HG--
branch : nooffset
also install _template.h files

--HG--
branch : nooffset
adding implementation of DJB's "optimizing linear maps modulo 2"

--HG--
branch : nooffset
adding more io for easier debugging and testing

--HG--
branch : nooffset
added a bit of documentation for DJB

--HG--
branch : nooffset
fixed bug

--HG--
branch : nooffset