Edge betweenness now will not fail with XGraph. The edge weights are all initially set to 1 which may not be the correct idea for graphs with weighted edges.
Edge betweenness now will not fail with XGraph.
The edge weights are all initially set to 1 which may
not be the correct idea for graphs with weighted edges.

Fixes #80.

--HG--
extra : convert_revision : svn%3A3ed01bd8-26fb-0310-9e4c-ca1a4053419f/networkx/trunk%40497

jtorrents/networkx,andnovar/networkx,sharifulgeo/networkx,dmoliveira/networkx,dhimmel/networkx,cmtm/networkx,aureooms/networkx,nathania/networkx,RMKD/networkx,NvanAdrichem/networkx,blublud/networkx,kai5263499/networkx,dmoliveira/networkx,wasade/networkx,aureooms/networkx,kernc/networkx,jakevdp/networkx,SanketDG/networkx,ionanrozenfeld/networkx,sharifulgeo/networkx,chrisnatali/networkx,jni/networkx,dhimmel/networkx,blublud/networkx,sharifulgeo/networkx,Sixshaman/networkx,blublud/networkx,OrkoHunter/networkx,RMKD/networkx,RMKD/networkx,ionanrozenfeld/networkx,jfinkels/networkx,jtorrents/networkx,farhaanbukhsh/networkx,harlowja/networkx,ghdk/networkx,michaelpacer/networkx,debsankha/networkx,chrisnatali/networkx,kai5263499/networkx,aureooms/networkx,debsankha/networkx,bzero/networkx,jcurbelo/networkx,kernc/networkx,bzero/networkx,yashu-seth/networkx,ionanrozenfeld/networkx,ghdk/networkx,beni55/networkx,jakevdp/networkx,ltiao/networkx,farhaanbukhsh/networkx,dhimmel/networkx,goulu/networkx,nathania/networkx,debsankha/networkx,nathania/networkx,bzero/networkx,dmoliveira/networkx,ghdk/networkx,harlowja/networkx,JamesClough/networkx,jni/networkx,kernc/networkx,harlowja/networkx,kai5263499/networkx,jni/networkx,chrisnatali/networkx,farhaanbukhsh/networkx,tmilicic/networkx,jakevdp/networkx