COMP: Fix scanf conversion specification to %u

Use %u for unsigned int conversion specification. This patch addresses
the following warning:

tkVTKImageIO.cxx(303): warning #181: argument is incompatible with
corresponding format string conversion
        sscanf(line, "%*s %*s %s %d", pixelType, &numComp)

Change-Id: Iba92a5e7fd65e9301666b061067378ed6834fba0
BUG: Making 2D Minc IO work properly

ENH: Bumped libminc version

Change-Id: Ie736c9114db5a68879fe7548019bd7014e0ab386
Merge topic 'MINC_2D_FIX'

864bd20 BUG: Making 2D Minc IO work properly
Merge topic 'FixVTKscanfWarning'

65a8674 COMP: Fix scanf conversion specification to %u