dfsbuild: changed 'sarge' to 'stable'
fixed 'TEMPLATE_DIR' ambiguity
web user interface improved (more state dependent)
doc: update
minor language improvement
added context sensitive help (hover)
css: changed hovered color of buttons to light green
hdf: renamed some elements of the data tree
cgi: language validation fixed
cgi: documentation language setting fixed
cgi: diskinfo rendering fixed