Bug#910098: groovy: improve doc linking and add missing dependencies

[Tiago Daitx]

Please consider the attached patch.

It includes one additional "fix" from the Ubuntu delta to get
groovydoc to ignore a file which was causing groovydoc to output a NUL
char to stdout, that in turn caused the archive builders to fail -
something about the python script giving up due to the output. I
believe the debian builders are not affected, but in case you see any
value on it, please use it. And if you really don't care about this
patch let me know and I will send another debdiff without it.

Note: for the Ubuntu side we have discussed cleaning up the output
from sbuild, it's on my todo list, I consider the exclude list to be a
temporary fix.
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