dopCalcSummary fix

Upon Heather’s tip - fixed the window data allocation
Another change to dopCalcSummary
updated dopEpoch

Problem with non-standard epoch settings (positive : positive as
opposed to negative positive) surrounding the event markers. Also
started on dopMessageSave but not ready yet
Merge branch 'master' of https://github.com/nicalbee/dopStep
added one sample ttest to dop output