GSLHelpers: print vectors/matrices to standard error
SuperSkyMetric: rename XLALSetLatticeSuperSkySpinBound() to XLALSetLatticePhysicalSpinBound()

- makes it clearer that this functions sets bounds on physical frequency/spindowns
SuperSkyMetrics: remove 'extra_padding' argument from XLALSetLatticePhysicalSpinBound()
LatticeTilingTest: print normal messages to stdout
LatticeTilingTest: use GSLHelpers.h to allocate/free GSL matrices
LatticeTilingTest: add a more extensive range of lattice tiling tests

- based on the tests performed in Redmine issues #1519, #1371, #614