Overrides check

[Christian-B]

Part of SpiNNakerManchester/SpiNNUtils#257

All typing changes and the below tiny changes

FromListConnector

• get_n_connections_from_pre_vertex_maximum simplified to help the TypeGuard

SpikeSourcePoissonVertex

• set_parameter_values uses is_iterable TypeGuard

SynapseDynamicsSTDP

• merge bug fix on call to SynapseDynamicsStructuralSTDP

SynapseDynamicsStructuralSTDP and SynapseDynamicsStructuralSTDP

• fixed is_same_as so that type must match and both parent is_same_as must pass

DataPopulation

• describe fixed ignore logs

AbstractSynapseDynamicsStructural

• initial_delay type change pending below
• see SynapseDynamicsStructural can the intial_delay ever be a Tuple #1427

SynapseDynamicsStructuralStatic

• see SynapseDynamicsStructural can the intial_delay ever be a Tuple #1427
• get_delay_maximum changed pending below
• see Can a connect ever return a None min or max delay #1428

LocalOnlyConvolution

• write_parameters fixed call to get_parameters_usage_in_bytes (param was wrong but unused)

DelayExtensionMachineVertex

• added and used overridden
• app_vertex property which returns a DelayExtensionVertex (or errors out)

ExternalDeviceLifControlVertex
init drop_late_spikes default move from param to inside method

Other none code none typing changes

adds PopulationApplicationVertex and MDSlice to the spelling exceptions

fix a spelling in a comment

one docs remove and overrides tag added

[coveralls]

coverage: 67.989% (-1.1%) from 69.136%
when pulling e4c3206 on overrides_check
into 7b68d2e on master.