Create release notes for dev/v2.1.x
[PLAT-4690] Fixed unset exchange notional fields on underlying swap
[PLAT-4654] Transforming FX-implied curves into implied deposit curves
[PLAT-4654] Change execute method to calibrate curve from implied deposits and compute Jacobian.
[PLAT-4723] Adding functions that calculate implied deposit rate time series for P&L calculations
[PLAT-4723] Removing debugging code
[PLAT-4748] fix for array length mismatch issue
[PLAT-4574] [PLAT-4527] Added CombinedHistoricalTimeSeriesMaster implementation; fixed up pagedSearch implementation in the CombinedMaster and updated tests.
[PLAT-4527] Switched search methods to use pagedSearch
Merge branch 'origin/develop'

Conflicts:
	RELEASE-NOTES.md
	projects/OG-Financial/src/main/java/com/opengamma/financial/analytics/model/curve/interestrate/MultiYieldCurveParRateMethodSeriesFunction.java
Bump version to 2.1.0-SNAPSHOT
[PLAT-4774] Truncate tiny values to zero
[PLAT-4774] Test absolute value, not value itself
fixed ValueGammaP scaling
[PLAT-4783] fix to allow overriding bbg ref data fields by ticker
[PLAT-4789] null handling to avoid IllegalArgumentException
[TMPL-38] Moving currency conversion for P&L series into the functions that calculate the series
[PLAT-4800] Excluding curves to be calculated using the ImpliedDeposit method
Javadoc

Cherry picked from aa13e8d2a52de8740363544d40029ae6e8688d6e
[PLAT-4625] method not found - PUT instead of GET for getViewportGridStructure

Cherry picked from 0ac5f09d556bd19a078be0c7981dae974ee66ddc