Wang–Müller line simplification algorithm in PostGIS

Motiejus Jakštys a63a6c51a9 fix gentle inflections -- both tests pass		2021-05-19 22:57:45 +03:00
db	more elaborate test cases	2021-05-19 22:57:45 +03:00
notes.txt	a line is a full bend now	2021-05-19 22:57:45 +03:00
tests.sql	fix gentle inflections -- both tests pass	2021-05-19 22:57:45 +03:00
wm.sql	fix gentle inflections -- both tests pass	2021-05-19 22:57:45 +03:00