trac #16712 removed bad use of exec
trac #16712 reviewer wish
No Subject. Modified: four_ti_2.py
Removed lat option from qsolve, rays, and circuits.
Trac #16712: remove bad use of exec in cluster code

There is one superfluous use of exec in cluster code. Let us remove
this.

This is related to #16065.

URL: http://trac.sagemath.org/16712
Reported by: chapoton
Ticket author(s): Frédéric Chapoton
Reviewer(s): André Apitzsch
Trac #14843: Minor improvments to 4ti2 interface

Here is a patch that introduces these two minor improvements to 4ti2
interface:
-It allows to pass the lattice to the methods instead of the matrix,
using the lat parmeter.
-Changes the verbose default to False, so we only get the output.

Example:

{{{
sage: four_ti_2.graver(lat=[[1,2,3],[1,1,1]])
[ 1  0 -1]
[ 0  1  2]
[ 1  1  1]
[ 2  1  0]
}}}

URL: http://trac.sagemath.org/14843
Reported by: mmarco
Ticket author(s): Miguel Marco
Reviewer(s): Dima Pasechnik