get emp history plot in
include script for bars. need to remove file dependency
new helper to add emp status to panel.
Filter out those in the other group.

When looking at unemployde we dont want to mix the
nonemployed in with the employed
accept kwargs in add_rec_bars
more updates
API: let helpers take kind argument
BUG: dont overwrite all the information in panel_store
add init for analysis
API: new file of functions to apply to panel.

apply those in make_panel
add analysis to setup.py
REF: add history moved to add_to_panel.

Made a few changes how it works. See docstring
BUG: fix setup.py filepath
API cps_store <- store and use append=False
API: move to closure
PERF: fill NATs before writing
REF: move closures to top level for testing.
BUG/TST: was getting false positives with history