Upgrade maxima to 5.26

Imported from <a href="http://trac.sagemath.org/sage_trac/ticket/10682">trac #10682</a>.

Reviewer patch

Reported by: fmaltey

Component: symbolics

CC: mjo

Report Upstream: N/A

Authors: Dmitrii Pasechnik

Dependencies: 

Work issues: 

Reviewers: Jean-Pierre Flori, Nils Bruin

Merged in: sage-5.0.beta8

Attachments: <ol><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/10682/trac_10682-reviewer.patch">trac_10682-reviewer.patch: Reviewer patch, formatting issues</a> by jpflori at 20120306T16:51:27</li><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/10682/trac_10682-spkg-dp.patch">trac_10682-spkg-dp.patch: spkg diff from author, for review only</a> by jpflori at 20120306T17:14:19</li><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/10682/trac10682_1.patch">trac10682_1.patch: Sage library patch to go with the new spkg </a> by dimpase at 20120308T11:21:59</li><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/10682/trac_10682-spkg.patch">trac_10682-spkg.patch: spkg diff from reviewer, for review only</a> by jpflori at 20120309T09:33:44</li><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/10682/trac_10682-reviewer-local.patch">trac_10682-reviewer-local.patch: Reviewer patch</a> by jpflori at 20120309T10:20:56</li></ol>