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b6e5345893
Adds a suite of new functions for querying data from the trading calendar.
These include:
`previous_trading_day`
`minutes_for_days_in_range` (minutely version of `days_in_range`)
`previous_open_and_close` (inverse of `next_open_and_close`)
`next_market_minute`
`previous_market_minute`
`open_close_window` (get a range of opens/closes with slicing semantics)
`market_minute_window` (get a range of minutes with slicing semantics)
Also refactors `test_finance` to move `TradingEnvironment` tests into their own
TestCase.