Trac #15372: Alternating sign matrix lattice will not plot.

If you do the following:

A=AlternatingSignMatrices(3)

A.lattice().plot()

you get an error, but

A.lattice() says it is a finite lattice with 7 elements, as it ought to
be.

The error says we need to implement the sort algorithm for
AlternatingSignMatrices.

URL: http://trac.sagemath.org/15372
Reported by: jessicapalencia
Ticket author(s): Jessica Striker
Reviewer(s): Viviane Pons
Trac #15391: Implementing the Foata bijection on permutations

Adds a method for applying the Foata bijection to a permutation.

URL: http://trac.sagemath.org/15391
Reported by: MariaMonks
Ticket author(s): Maria Monks
Reviewer(s): Jessica Striker, Travis Scrimshaw
Trac #15185: Clean up interface to the PARI library

The file `sage/libs/pari/gen.pyx` is too big and contains too many
different things.  For clarity and maintainability, it should be split
into two parts:
- `gen.pyx` containing the class `gen`;
- `pari_instance.pyx` containing the class `PariInstance` and some
utility functions;
More cleaning-up will be done in #15461.

URL: http://trac.sagemath.org/15185
Reported by: pbruin
Ticket author(s): Peter Bruin
Reviewer(s): Jeroen Demeyer
Trac #15461: Clean up interface to the PARI library, II

After #15185, the following changes are made in this ticket:

- The `gen` class currently contains duplicates of various methods of
`PariInstance` (such as `new_gen`) for no obvious reason.  These methods
will be deleted.

- Remove obsolete code (e.g. `add_unsafe`, which currently is not used,
and probably never should be).

URL: http://trac.sagemath.org/15461
Reported by: pbruin
Ticket author(s): Peter Bruin
Reviewer(s): Jeroen Demeyer
Trac #15409: Simplify sage/symbolic cythonization.

Glob-style module specification, inline library and language specifiers.

URL: http://trac.sagemath.org/15409
Reported by: robertwb
Ticket author(s): Robert Bradshaw
Reviewer(s): Nathann Cohen
Trac #15412: Simplify cythonization of sage/combinat.

Use new glob-style pattern.

URL: http://trac.sagemath.org/15412
Reported by: robertwb
Ticket author(s): Robert Bradshaw
Reviewer(s): Nathann Cohen