now subclassing Copyable to make bootstraps and other resampling easier
support for sub-classing
unscaling now defaults to 0
better class hierarchy for RSA
utility function for creating RSA model from a disvol
utility function for converting between SPM and pilab GLM format
function for identifying dissimilarities in a vectorised RDM that correspond to a particular condition (rows/columns in squareform RDM)
for reference