Fixed GrossWeightSmoothed to handle masked fuel flow data.
Updated can_operate methods to name first arg as class for classmethod
Added FlapSet and SlatSet KTIs for FMIS KPVs.
Added new FMIS KPVs and tests. The majority have been coded.
Spacing only.
Fixed new test for FormattedNameNode within_slices arg.
Spacing only.
is_index_within_slices, slices_duration, slices_after, slices_before

Functions added to the library with tests.
Added within_slices to FormattedNameNode get conditions.

It wouldn't be difficult to add to other applicable Nodes.
Added 700 ft to altitude when climbing values for FMIS KPVs.
Simplified KPV logic and Gear Down Selection and others
Removed unused imports from derived_parameters.py
Merge branch 'master' of https://github.com/FlightDataServices/FlightDataAnalyzer
Updated FlapAngle to support 787 Flap Slat combination.
SlatSurface parameter added for 787 Slat combining.
Updated FlapAngle tests.
Changed Speedbrake to use different spoilers for 787.
Added test for NodeManager.operational accepting kwarg Attributes.
Changed Configuration can_operate to use attribute
Merge branch 'master' of https://github.com/FlightDataServices/FlightDataAnalyzer