Wang–Müller line simplification algorithm in PostGIS

Motiejus Jakštys 06314d77c0 (somewhat) fix index calculation		2021-05-19 22:57:45 +03:00
db	more elaborate test cases	2021-05-19 22:57:45 +03:00
notes.txt	wip demo self-crossing: it's now incorrectly mutating things	2021-05-19 22:57:45 +03:00
tests.sql	more self-crossing and documentation	2021-05-19 22:57:45 +03:00
wm.sql	(somewhat) fix index calculation	2021-05-19 22:57:45 +03:00