Bug#629107: hydrogen: No text in User Manual

[trebmuh at tuxfamily.org]

Dear debian multimedia maintainer,

I can confirm that this bug is still present in the current build 
system. That said, some of this bug-related-outcomes have changed since 
the original report. You can have an overview of the current situation 
by reading at https://github.com/hydrogen-music/hydrogen/issues/74 .

I've been trying to find a correct solution but am getting lost 
somewhere and need someone which understand better than me what the 
debian/rules is supposed to be doing with those files and why it fails 
to doing so.

Hope that helps,
Olivier (olinuxx/trebmuh)