gis/TauDEM: Moved from academic/ category.

Signed-off-by: David Spencer <baildon.research@googlemail.com>

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+TauDEM (Terrain Analysis Using Digital Elevation Models) is a suite of Digital
+Elevation Model (DEM) tools for the extraction and analysis of hydrologic
+information from topography as represented by a DEM. TauDEM provides the
+following capability:
+
+* Development of hydrologically correct (pit removed) DEMs using the flooding
+  approach
+* Calculates flow paths (directions) and slopes
+* Calculates contributing area using single and multiple flow direction methods
+* Multiple methods for the delineation of stream networks including topographic
+  form-based methods sensitive to spatially variable drainage density
+* Objective methods for determination of the channel network delineation
+  threshold based on stream drops
+* Delineation of watersheds and subwatersheds draining to each stream segment
+  and association between watershed and segment attributes for setting up
+  hydrologic models
+* Specialized functions for terrain analysis
+
+Note TauDEM also works fine with MPICH, so if you have it installed it is not
+necessary to install OpenMPI.