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Fix #1541 - skip transit edges in spatial index.
replace copy-on-write edge sets with simple arrays and convenience methods
Merge pull request #1542 from laurentg/fix-1541

Fix #1541 - skip transit edges in spatial index.
remove IterableLibrary, replace with Guava Iterables.filter
log unlinked stops at debug-level, add summary message

this makes tests and graph building much less noisy
make test stop failing nondeterministically
Add a generic street notes source interface.

Put all note-related stuff to dedicated package.
Extract few inner class as top-level classes.
Add few comments.
Merge pull request #1543 from laurentg/pse-optimizations

Add a generic street notes source interface.