Add info about XFCE: Settings Editor and MIME Type Editor
desktop-xfce/index.txt: paraphrase text from  prew. commit
remove "Warnings" about creating documentationf from vm.txt
add "[float]" before 4 level topic "==== topic ===="
Remove chromium from include.

The reason is: Chromium couldn't be installed from CD or DVD disc.
Merge branch 'master' into centaurus

Conflicts:
	desktop-software/internet/web/index.txt
	desktop-software/others/medit/index.txt
	desktop-xfce/index.txt
Remove unused files