modified smoothing code (bath_tools.RoughnessMatrix, bathy_smoothing.smoothing_Laplacian_rx0, bathy_smoothing.smoothing_PlusMinus_rx0) from pyroms
python testmain_smLPLS.py > testsmLPLS.txt : sample for test between bath_tools.RoughnessMatrix and RoughMtrx (modified) and between bathy_smoothing.smoothing_Laplacian_rx0 and smthng_laplacian_rx0 (modified)
python testmain_smPLMN.py > testsmPLMN : sample for test between bath_tools.RoughnessMatrix and RoughMtrx (modified) and between bathy_smoothing.smoothing_PlusMinus_rx0 and smthng_PlsMns_rx0 (modified)