Added ability to adjust for non-stationarity in TFCE-based methods. Still need to handle supra-threshold clustering
modified mrclusterstats to adjust of non-stationarity by default
mrclusterstats: added parameter comments in the output image headers
small fix to mrclusterstats
update non-stationary adjusment precomputation message
fixed bug n tfce nonstationary adjustment
Fixed some issues with tfce nonstationary adjustment
Added MR:File:exists() utility function
small update to tfce.h
removed exists() function from file utils
small fix in tfce nonstationary adjustment
temporarily removed automatic opposite contrast calculations in tfce stats
input user defined number of permutations for nonstationary correction adjustment
correction to permutation stack output
negative constrast is no longer computed by default in mrclusterstats
fixed bug in tfce update
minor updates to fix problem with recent tfce commit
small fix to mrclusterstats and changes to the output
Merge branch 'nonstationary_stats'