updated layout settings for GMSH preferences dialog
resized some dialogs
rename MeshGeoTools namespace to MeshGeoToolsLib to make it consistent with a directory name
refactor rotation functions to seprate functions to compute a rotation matrix and a function to rotate points with a given rotation matrix
Merge pull request #370 from norihiro-w/rename-namespace-MeshGeoTools

rename MeshGeoTools namespace to MeshGeoToolsLib
use Point class instead of double* in GeoLib
Merge pull request #372 from norihiro-w/use-Point

use Point class instead of double* in GeoLib
Merge pull request #371 from norihiro-w/refactor-rotate

Refactoring point rotation functions