Now we first fix empty cells with incoming connections
then we fix cells with rails and wrong transition maps.

fixed how a-start works. we can now force it to ignore illegal rail elements. This might be a bit dangerous as you need to fix them later one ( done in current code). Maybe better suggestions here!?

fixed how a-start works. we can now force it to ignore illegal rail elements. This might be a bit dangerous as you need to fix them later one ( done in current code). Maybe better suggestions here!?

also update what nodes are chosen for connections

first commit of improved level generator. Now cities are not connected from the center but rather from the boarders. NESW

Resolve "Test for Multi-Speed"

Closes #163 and #168

See merge request flatland/flatland!194

Merge branch '173-refactoring-type-hints-named-structures-for-observation-builders-and-predictors' into 'master'

Resolve "Refactoring: Type hints/named structures for observation builders and predictors."

See merge request flatland/flatland!195

Resolve "Enhance sparse_rail_generator"

Closes #169

See merge request flatland/flatland!190

Merge branch '169-Enhance_sparse_rail_generator' of gitlab.aicrowd.com:flatland/flatland into 163-multispeed-tests-penalties

Merge branch '169-Enhance_sparse_rail_generator' of gitlab.aicrowd.com:flatland/flatland into 163-multispeed-tests-penalties

Merge branch '169-Enhance_sparse_rail_generator' of gitlab.aicrowd.com:flatland/flatland into 163-multispeed-tests-penalties