Added a bit more plotting to GrcjDru1B

it now shows plots aligned to stim, cue and dim.
Also updated to more current code
Added default settings to Analyze_MsaccData

It now has a set of default settings that will be overwritten if you
specify someting else.
Added comment to AlignCtxAndNlxData

Added comment to AlignCtxAndNlxData
Added CombineStructures

small general function for combining structures. Is needed for combining
setup structures in Analyze_MsaccData. But might be useful for a lot of
other stuff