Replace infinite values with float max in Matrix Viewer

Some connectivity measures generated with BCT analyzers have infinite values and they cannot be displayed with the Matrix Viewer. Normally we should use the is_finite value of datatypes that inherit from DatatypeMatrix and not display the Matrix Viewer for those datatypes but in this case the Matrix Viewer is the only viewer that these datatypes have so having no viewer means they are not really useful. That is why the chosen solution is to replace infinite values with float max.