add MathLib/Nonlinear in CMakeLists.txt
- move VecNormType to LinAlgEnums.h
- extend norm functions
add Picard class
add tests for Picard
remove unnecessary include
document private members
rename template parameter names and add documententation
make file ending consistent with other files
fixed indentation
domain ICs can be created in GUI similar to direct STs
domain ICs are can be read from file
formatting and removal of unneeded code
Merge pull request #422 from rinkk/DomainICinGUI

Domain ICs in GUI
adjusted radiobutton-text for shape import
removed layer tag in legacy mesh output
Merge branch 'master' of https://github.com/ufz/ogs
fixed sequence of writing for various condition types in cnd-file
Fixed some warnings under CMake 3.0.0
condition-files can now be read from and written to ogs-project-files
adjusted cnd-interface test