[MINC-development] Fix for a segfault in dcm2mnc

[Jordi Gutiérrez Hermoso]

Hi, I have patched on the development branch a problem with an
uninitialised variable that was causing dcm2mnc to segfault. You can
pull my fix here:

    http://inversethought.com/hg/minc-tools/graph

There is another commit there for silencing some warnings that could
be problematic.

HTH,
- Jordi G. H.