Multimodular echelon form over cyclotomic fields fails

Imported from <a href="http://trac.sagemath.org/sage_trac/ticket/10281">trac #10281</a>.

This patch is for beta9.  I've made the one change that robertwb suggests to this patch (the formal cython change)

Reported by: mraum

Component: linear algebra

CC: 

Report Upstream: N/A

Authors: William Stein

Dependencies: 

Work issues: 

Reviewers: Martin Raum

Merged in: sage-5.0.beta14

Attachments: <ol><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/10281/trac_10281-sage-5.0-beta9.patch">trac_10281-sage-5.0-beta9.patch: This patch is for beta9.  I've made the one change that robertwb suggests to this patch (the formal cython change)</a> by was at 20120318T12:49:26</li></ol>