Made default Dimension names upper case
Simplified dimensions parameter (now always cast to Dimension)
Simplified DataLayer sample and reduce method
Fixed various properties on DataLayer
Fixed len counting for DataGridPlot
Fixed docstrings on sample and reduce methods on View
Ensuring Layout Dimension is always a Dimension object
Simplified sampling and reducing on Tables and introduced collating
Cleanup (mainly line wrapping) in SheetView
Simplified sample reduce on SheetView
Simplfied sample/reduce on SheetStack
Fixes to grid_sample on SheetViews
Updated Tutorial notebooks