Wrap IML calls in sig_on()

[jdemeyer]

In devel/sage/sage/matrix/matrix_integer_dense.pyx, wrap IML calls in _solve_iml() in sig_on()/sig_off().

The patch also changes the exception type for non-square matrices from ArithmeticError to ValueError, since that's just a limitation of the implementation, it's not a mathematical obstruction.

Depends on #13311

CC: @malb

Component: linear algebra

Author: Jeroen Demeyer

Reviewer: Martin Albrecht

Merged: sage-5.13.beta5

Issue created by migration from https://trac.sagemath.org/ticket/15453

[jdemeyer]

Dependencies: #13311

[malb]

Reviewer: Martin Albrecht

[malb]

comment:2

Attachment: 15453_iml_sig_on.patch.gz

patch looks good and passes test. However, can you document the fact that you changed the exception in the ticket's description. After that, it's an automatic positive review.

[jdemeyer]

Merged: sage-5.13.beta5