Added PETScWallClockTimer
Changed classes of RunTime and CPUTime
More changes for CPUTime and RunTime
Removed changes in CLI
Recovery CLI/CMakeLists.txt
Changed a variable name for classes RunTime and CPUTime
Minor changes afer rebasing onto ufz/master
Uniform copyright year in one file
Changed one word in comment
Removed class PETScWallClockTimer and minor changes in cmake files
Fixed compiler error and other minor changes
Change one option for cmake.
Minor change in cmake concerning to MPI option.
Replace tab space with four blank spaces as indetation in one CMakeLists.txt
Minor changes related MPI option of cmake.
Merge pull request #512 from wenqing/timer

Update RunTime and CPUTime for mpi support.
[PL] Add mesh node ids for BoundaryCondition.
[PL] Initialize node ids vec in boundary conditions.