merge dev_4_4 -D org -I include -E exclude: PR 261 (Generate PDF using XeLaTeX)
merge dev_4_4 -D org -I include -E exclude: PR 368 (Cpp: Correct content and markup)
merge dev_4_4 -D org -I include -E exclude: PR 454 (Expand the title of the "writing tests" page)
merge dev_4_4 -D org -I include -E exclude: PR 455 (Clean up testing.txt)