DVCS Interfaces should't use QString

[Andreas Pakulat]

Hi,

Aleix just pointed out on IRC that the DVCS interfaces uses QString as
source repository location. That should be changed to be a VcsLocation.

In fact as VcsLocation resembles both a local or a repository location
we should probable change the interfaces to always take VcsLocation,
even for local files. Except for a few ones, which really need to work
with any local file (like isVersionControlled should be feedable with any
url).

Andreass

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