allow embedding python tuples in SR

[burcin]

Attached patch allows embedding Python tuples in symbolic expressions:

sage: t = SR._force_tuple((1, 2, x, x+1, x+2))
sage: t
(1, 2, x, x + 1, x + 2)
sage: t.subs(x = 2*x^2)
(1, 2, 2*x^2, 2*x^2 + 1, 2*x^2 + 2)
sage: t.op[0]
1
sage: t.op[2]
x

Includes pynac 0.3.2 update for explicit template instantiatitons

http://boxen.math.washington.edu/home/vbraun/upstream/pynac-0.3.2.tar.bz2

CC: @eviatarbach

Component: symbolics

Keywords: sd48

Author: Burcin Erocal, Volker Braun

Branch/Commit: aa7287f

Reviewer: Volker Braun, Jean-Pierre Flori

Issue created by migration from https://trac.sagemath.org/ticket/14780

[burcin]

Changed keywords from none to sd48

[burcin]

Description changed:

--- 
+++ 
@@ -11,4 +11,6 @@
 sage: t.op[2]
 x
 ```
+ 
+Apply: [attachment: trac_14780-embed_tuples_in_SR.patch](https://github.com/sagemath/sage-prod/files/10658003/trac_14780-embed_tuples_in_SR.patch.gz)
 

[burcin]

Author: Burcin Erocal

[vbraun]

comment:2

We were discussing an optional recursive=[True|False] keyword argument at SD48. Are you still going to implement this? Similar for the unpacking at #14802.

[burcin]

comment:3

Replying to @vbraun:

We were discussing an optional recursive=[True|False] keyword argument at SD48. Are you still going to implement this?

I replaced the attached patch. New version supports recursive=[True|False].

[burcin]

Attachment: trac_14780-embed_tuples_in_SR.patch.gz

[vbraun]

comment:4

Looks good to me

[vbraun]

Reviewer: Volker Braun