Added dense formatting
Added formatting for init
Added empirical tests and renamed old_format_data
Format data takes kwargs and can eval them
Added dense data formatting for main
Fixed merge conflict
Fixed _init_ header
Used data_read_write function in main
Made evaluation mandatory when setting defaults
Added general data_read_write fxn
Made format_dense take DataFrame and output DataFrame per issue #60
Added documentation and changed columnar to stacked
Merge branch 'origin/add_format_functions' into develop

Conflicts: