rewrite conway polynomial spkg and code in Sage library to not use ZODB

Imported from <a href="http://trac.sagemath.org/sage_trac/ticket/12205">trac #12205</a>.



Reported by: was

Component: databases

CC: kini

Report Upstream: N/A

Authors: R. Andrew Ohana

Dependencies: <a href="http://trac.sagemath.org/sage_trac/ticket/13896">trac #13896</a>, <a href="http://trac.sagemath.org/sage_trac/ticket/13963">trac #13963</a>

Work issues: 

Reviewers: François Bissey

Merged in: sage-5.7.beta0

Attachments: <ol><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/12205/trac12205.patch">trac12205.patch: apply to sage library</a> by rohana at 20130103T11:19:24</li><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/12205/trac12205_root.2.patch">trac12205_root.2.patch: updated sage_root repo patch</a> by fbissey at 20130114T10:26:42</li><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/12205/12205_root.patch">12205_root.patch: </a> by jdemeyer at 20130115T10:26:10</li></ol>