Better automatic backtrace

Imported from <a href="http://trac.sagemath.org/sage_trac/ticket/13889">trac #13889</a>.

Initial patch

Reported by: vbraun

Component: build

CC: SimonKing

Report Upstream: N/A

Authors: Volker Braun

Dependencies: <a href="http://trac.sagemath.org/sage_trac/ticket/13881">trac #13881</a>, <a href="http://trac.sagemath.org/sage_trac/ticket/13866">trac #13866</a>

Work issues: 

Reviewers: Jeroen Demeyer

Merged in: sage-5.7.beta0

Attachments: <ol><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/13889/sage_crash_Ho8Cji.log">sage_crash_Ho8Cji.log: Sample log</a> by jdemeyer at 20130114T10:25:59</li><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/13889/trac_13889_crime_scene_inspector.patch">trac_13889_crime_scene_inspector.patch: Updated patch</a> by vbraun at 20130115T10:15:21</li><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/13889/trac_13889_enhanced_backtrace.patch">trac_13889_enhanced_backtrace.patch: Updated patch</a> by jdemeyer at 20130115T16:19:56</li><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/13889/13889_disable_osx.patch">13889_disable_osx.patch: Initial patch</a> by vbraun at 20130120T21:11:27</li></ol>