update of external libraries LinBox,Givaro and FFLAS-FFPACK

Hi Mike,

linbox updated to version 1.3.2,
givaro to 3.7
fflas-ffpack to 1.6.0

-Unit tests for fast linear algebra did pass on my FC17, 32 Bit OS
-Macaulay2 did successfully build without FLA 

Please review the changes and comment.

Remark:  the issue on Ubuntu you mentioned in the past  is /was that Ubuntu supports  selection of a certain libraries if there are several available. I did not recheck, but it seems that fflas_ffpack  did not like or detect the default one. But at least 'atlas' or 'atlas3g' (?) should be work. 
I do not recall the commands for the moment, but I goggled and found the following reference :
http://www.stat.cmu.edu/~nmv/2013/07/09/for-faster-r-use-openblas-instead-better-than-atlas-trivial-to-switch-to-on-ubuntu/
I hope that helps

Best,


Jakob