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
fix simplifyIdeal (char 2)
fix: tr. #674
additional test for lduSolve
revisiting kstd1::red*: cleanup
use standard names: int_number -> mpz_prt, NATNUMBER ->unsigned long
fix: tr. #672
Default s_res to work over basering and return the usual resolution object (if set RINGCHANGE=0 SSinit attribute) or return SRES as before

chg: minor cleanup
fix: bug (unable to load...)
Preparations for using s_res via res

TODO: enable it
NOTE: only for testing at the moment
Added s_res_bm : benchmarking resolution computation (slower than s_res due to interpreter use)
Fix wrong RINGCHANGE attribute reading
Note on build system: Singular relinking upon changing any library!
fix minpoly handling (normal::genus)
removed wrong assume
fix: tr. #676 (simplifyIdeal did not simplify)
Merge pull request #675 from adipopescu/Flint

Flint
fix: tr. #677 by pfister