padNArows moved to a non-exported function
helper functions for concat.split.expanded
helper function for concat.split.condensed
convenience function for subsetting columns by name
allow examples to be run
helper functions moved to a "non-exported" file for convenience
concat.split has been refactored entirely and is much faster
concat.split has been entirely reworked. Advanced example removed since it is much easier now with concat.split.multiple
updated to use othernames function
all related concat.split functions in one file
auto code changes from roxygen2
updated to reflect recent changes