fix doctest failures in doc/en/constructions/interface_issues.rst due to upgrade to Maxima 5.19.1

[sagetrac-drkirkby]

On Solaris 10 update 7 (SPARC), the following test failed. Both ECL and Maxima were updated - ECL version 9.8.4, Maxima version 5.19.1. Sage was built with gcc 4.4.1

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| Sage Version 4.1.1, Release Date: 2009-08-14                       |
| Type notebook() for the GUI, and license() for information.        |
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Thu Aug 20 20:02:37 BST 2009
dsage-trial tmp directory doesn't exist - creating ...
This script will run the unit tests for DSage

sage -t  "devel/sage/doc/en/constructions/interface_issues.rst"
**********************************************************************
File "/export/home/drkirkby/sage/sage-4.1.1/devel/sage/doc/en/constructions/interface_issues.rst", line 478:
    sage: maxima.eval("f:bessel_y (v, w)")
Expected:
    '?%bessel_y(v,w)'
Got:
    'bessel_y(v,w)'
**********************************************************************
File "/export/home/drkirkby/sage/sage-4.1.1/devel/sage/doc/en/constructions/interface_issues.rst", line 480:
    sage: maxima.eval("diff(f,w)")
Expected:
    '(?%bessel_y(v-1,w)-?%bessel_y(v+1,w))/2'
Got:
    '(bessel_y(v-1,w)-bessel_y(v+1,w))/2'
**********************************************************************
File "/export/home/drkirkby/sage/sage-4.1.1/devel/sage/doc/en/constructions/interface_issues.rst", line 482:
    sage: maxima.eval("diff (jacobi_sn (u, m), u)")
Expected:
    '?%jacobi_cn(u,m)*?%jacobi_dn(u,m)'
Got:
    'jacobi_cn(u,m)*jacobi_dn(u,m)'
**********************************************************************
1 items had failures:
   3 of   9 in __main__.example_3
***Test Failed*** 3 failures.
For whitespace errors, see the file /export/home/drkirkby/sage/sage-4.1.1/tmp/.doctest_interface_issues.py
         [19.8 s]

Component: interfaces

Keywords: maxima

Issue created by migration from https://trac.sagemath.org/ticket/6784

[aghitza]

Changed keywords from none to maxima

[aghitza]

comment:2

Simply due to new Maxima de-uglifying its output. See attached patch.

[aghitza]

Attachment: trac_6784.patch.gz

apply after spkg's at #6564 and #6699

[sagetrac-mvngu]

comment:5

This is fixed by #6699.