Be more careful to retry when the feature count is exceeded (#257)

* Clip before dealing with multiplier or filters in overzoom

* Be more careful to retry when the feature count is exceeded

* Adjust the estimated total feature count for the multiplier too

* Fix the feature count estimates, I think

* Pass build info into the version string

* Report the actual max zoom of any tiles as the metadata maxzoom

* Revert unneeded renaming to make the diff more readable

* Clean up the adjustments to tile sizes and feature counts

* Update version and changelog

* Dropping a feature into a multiplier cluster still effectively drops it

* Update changelog

* Rethink the changelog description

* Don't try to truncate zooms if we are still tiling at z18

Makefile

@@ -1,14 +1,15 @@
 PREFIX ?= /usr/local
 MANDIR ?= $(PREFIX)/share/man/man1/
 BUILDTYPE ?= Release
+BUILD_INFO ?=
 SHELL = /bin/sh
 
 
 # inherit from env if set
 CC := $(CC)
 CXX := $(CXX)
-CFLAGS := $(CFLAGS) -fPIE
-CXXFLAGS := $(CXXFLAGS) -std=c++17 -fPIE
+CFLAGS := $(CFLAGS) -fPIE -DBUILD_INFO=$(BUILD_INFO)
+CXXFLAGS := $(CXXFLAGS) -std=c++17 -fPIE -DBUILD_INFO=$(BUILD_INFO)
 LDFLAGS := $(LDFLAGS)
 WARNING_FLAGS := -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow
 RELEASE_FLAGS := -O3 -DNDEBUG