prepare for 6.2.2 release
fix ubuntu package names in travis
Merge branch 'branch-6-2' into branch-6-4

Conflicts:
	.travis.yml
	HISTORY.TXT
	mapserver.h
prepare for 6.4.1 release
add SVG_INCLUDE_DIR so that svg.h is found
Merge branch 'branch-6-4'

Conflicts:
	CMakeLists.txt
Fix non-default harfbuzz configuration logic (#4848)