Adjust armadillo minimum version to that shipped by Ubuntu 14.04
Bug fix in cmakelists.txt involving volk_gnsssdr autobuild for
front-end-cal (credits to Carles!)
Merge branch 'next' of git+ssh://github.com/carlesfernandez/gnss-sdr
into next

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small fix
Merge branch 'next' into next-andres