TPS: when using Armadillo to solve the coefficients, use solve(A,B) instead of inv(A)xB to faster resolution

git-svn-id: https://svn.osgeo.org/gdal/trunk@26650 f0d54148-0727-0410-94bb-9a71ac55c965
TPS: when using Armadillo to solve the coefficients, use solve(A,B) instead of inv(A)xB to faster resolution

git-svn-id: https://svn.osgeo.org/gdal/trunk@26651 f0d54148-0727-0410-94bb-9a71ac55c965
TPS: compute direct and inverse transformations in parallel when warping option NUM_THREADS or GDAL_NUM_THREADS config. options are set to > 1

git-svn-id: https://svn.osgeo.org/gdal/trunk@26652 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' into trunk_travis_macosx