bug#22705: audacity help doesn't work

[Danny Milosavljevic]

Package: audacity

Running audacity and then opening Help -> Manual doesn't work since, among 
other things, it defaults to using the local help (non-internet) and can't find 
it.

I'd suggest one of
(1) automatically install the local manual as well, or
(2) default HelpMode to internet help (see 
audacity-minsrc-2.1.2/src/widgets/HelpSystem.cpp HelpSystem::ShowHelpDialog)

Audacity does provide an error dialog with a link where the user could download 
the manual - but it doesn't work since xdg-open is not installed (see bug# 
22704).