update plot_params() for alphabetical order of dir_bases for equal probabilities
ENH: plot_results.py: more colors and markers

- update plot_params() for more than 5 colors
- update plot_fit_info() for more than 5 colors, add markers, alpha
- new make_colors(), get_colors(), Cycler, markers
update groups.py for new group definition file

- new age_group, pig_group columns
- update parse_row(), read_group_info(), map_group_names()
- update get_datasets_of_group() - new arguments: group_name, val
update plot_results.py for current groups.py
plot_results.py: label logs by their index instead of number of components

- update plot_fit_info(), plot_params()