Tradingstrategy

- PR 326 Fix set_fundmode in bbroker
- Synchronize fund history mode with master clock
- Allow relocation of legend in plotting charts
- Adapt broker observer to fund mode

- Handle volume as string null in YahooFinanceData
- Corrections/Improvements to order history support
- Add fund history support
- Increase plotting margin of trade observers

- Add addorder_history support to replay history of orders
- Add swapcloses to YahooFinanceXXX family to allow end users to control what
the adjusted price actually is
- Some docs and samples updates
- Change default for _nextforce to False as it should be for most indicators

- Add haDelta indicator
- Allow indicators to disable runonce
- Add Renko bricks
- Rework ix -> iloc pull request and autodetection algorithm in PandasData

- Fix 323 by providing default properties/methods for fundvalue/fundshares
for all brokers

- Redownload the YahooFinance sample data yhoo-1996-2015
- Add unstable exception for TALIB SAR
- Add notes about usage of Hurst exponent and lag_start/lag_end parameters
to override default lag values
- Fix 321 by correcting typo in Writer.writelines
- Add _start/start methods to Observers
- Add fund tracking mode to the observers
- Add new observers FundValue/FundShares
- Adapt observers to fundmode: Value, TimeReturn, LogReturns, DrawDown,
Benchmark
- Adapt analyzers to fundmode: DrawDown, Leverage, LogReturnsRolling,
PeriodStats, LogReturns, Sharpe, TimeReturn, VWR
- PR 319 for Pandas .ix deprecation (rewritten)