Pre/post market quote and trade functions

Pre and post market data is now split into two functions: the quote function has a new name and a new trade function joins it. See Pre/Post Market and Pre/Post Market Trades.

• NEW prePostMarketTrade function: the latest pre- and post-market trade price, trade size, and timestamp for US equities, for a single symbol or a batch range. See Pre/Post Market Trades Batch.

• CHANGE prePostMarket is now prePostMarketQuote. Existing formulas with the old name keep working and return the same quote data.

• CHANGE quote metric names: ask and bid are now askPrice and bidPrice. The old names still work.