add LLL_Flint feature: if called system(LLL_Flint, l, 1) will return
                       as a second entry also the transformation matrix
                       if called system(LLL_Flint, l, 0) will return
                       just the matrix - as system(LLL_Flint, l)
commented: FLINT_VER_2_4_5
fix: LLL_Flint
fix: more memory stuff
Merge pull request #675 from adipopescu/Flint

Flint