fixed some typos
show stacktrace in a new line after the error message
Breadth-first search for files. Ensure that files will be found in the actual folder
or in the nearest subfolder in case the filename exists more than once.
Better error message on missing attributes for DefineFontfamily
Merge remote-tracking branch 'upstream/develop' into develop

Conflicts:
	doc/manual/doc/description-en/xpath.md