eliminate use of data_snapshots_data_source module by putting that content type into data_snapshots module
remove unused data_snapshots_data_source module
really remove unused data_snapshots_data_source module this time
move data_snapshots module files up into root directory; eliminate `modules` subdir
remove unused data_snapshots_section module; now have just one module: data_snapshots
add admin config screen
move new data_snapshots.padding_stks.inc file from modules/data_snapshots into top level dir
removes potential division by 0 error
adds slider tickmarks. closes #33
abstracts some functions
adds css to display of data source pages
fixes css bug