- reworked priorities.hxx/.cxx to make valgrind happy. It also allows us to add more features per area (like smoothing).
- remove TG_MAX_AREA_TYPES - we had a merge request for this, but this does essentially the same thing with the refactoring.
- fixed some edge matching introduced in multithreaded construct.
- tgconstruct objects now live for an entire stage. 1 for each thread - this introduced the memory leaks, and some issues.
interesting side effect is that we do less alloc / free, since we use std::vectors which when cleared, don't actually free
memory, so by the end, we've allocated enough entries for the largest tile.
- fixed linear feature issue in genapts850 - the refactor caused some of the old clean functions to remove too many polys!
with cgal, we need far less cleaning - just do what construct does, and we can still parse all airports, and lines are back.
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