Summer Bank Holiday

• [fidelity] Cash interest earned is now included in Activity
• [schwab] Cash interest earned and margin interest charged is now included in Activity
• [ibkr] Fixed market data quotes for futures and futures options
  • Added optional exchange field to Instrument type, which is necessary to quote futures, and possibly more
• Added analysis.timelineForSymbol(), which transforms an activity log into position information (e.g., size and realized profit) over time
• Exposed analysis.normalizeSymbol() and analysis.normalizeInstrument(), for aligning cross-brokerage data
• Exposed analysis.activityAffectsSymbol(), which can be used as a sort of pattern-matching over activity logs