Titan2d-3.0.0-mod: A version of code modified from TITAN2D-3.0.0

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1. TITAN2D is a software for simulating dry granular avalanche flows over natural terrians expressed by DEM. Titan2d-3.0.0-mod (called titan2d-3.1.1, 2016.03.14) is a version modified from the open version 3.0.0 (2011) on the web of GMFG of University at Buffalo.
   Compared with 3.0.0, some bugs and errors are corrected, stopping criteria are added, and a new Carteisan formulation of the Savage-Hutter model is implemented in this modifed code as default.
   readme
   source code
   example DEM map for GRASS
   Tutorial:
   titan_userguide.pdf
   titan-new model.pdf
   These two files and further documents are also in directory /tutorial of the unzipped source code.