Began refactoring of plotting_utils - started by simplifying data cleaning, data manipulation, and references to M_c
Use schema to determine column types in parse_data_for_hist instead of getting modeltype from M_c
Further refactoring: all 2-d plots should work well based on schema now.
Refactored mult1D and cont1D plotting sections. Eventually may break into different methods instead of if/else statement.
UPDATE SCHEMA to cyclic type now requires (min, max) be included as parameters after the column name.
Merge branch 'dev' into cyclic-plot
Cyclic columns can be plotted now, but they're treated as continuous columns. We may replace this with polar plotting, but for now this is just enough to work.