renamed
abstract interface tests and make a template function
add a test to check interface of global matrix classes. first example is with GlobalDenseMatrix
Handle the case only one geometry is selected correctly.
Merge pull request #150 from norihiro-w/add-test-global-matric-interface

Rework on TestVector and add TestGlobalMatrixInterface
Merge pull request #154 from TomFischer/FixGMSHBug

BugFix: Handle the case that only one geometry is selected correctly.
Fix for a selection bug discovered by Tom.
Fix for restoring the mouse cursor after a gmsh run as observed by Tom.