This is a regression fix for the Collada importer:
The importer used to set the length of the last bone in a chain to the
length of the smallest bone in the armature. This was the best
alternative to get around the problem that collada only knows joints but
not bones. During recent development this feature got broken (soprry, i
did that) and since the breakage happened the collada importer set the
length of the last bone in a chain to 1 Blender unit.
The commit 1346482d23f167fa57049128384246397fda8d27 fixes this and make
the importer again set the bone length of the leaf bones as before.
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