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
Fix non-labelcache'd drawing of line and polygon labels (#4837)
avoid erroneous error condition on too short lines (#4838)
Fix angle follow calculation on vertical or horizontal lines (#4839)
add SVG_INCLUDE_DIR so that svg.h is found
WFS 1.1/2.0: fix warning message when layer name is invalid to expand '%s' to layer name
Merge branch 'branch-6-4'

Conflicts:
	CMakeLists.txt
Fix non-default harfbuzz configuration logic (#4848)
Escape backslashes in the mapfile string writer (#4747)
Merge branch 'branch-6-4'