Merged requested to merge feature/fs289-fluidframework-doxygen into master
The Chapter fluid-framework is transferred to Doxygen.
- Explanations have been added to modules.txt
- Function documentation for fluidstates, fluidsystems etc. transferred to header files.
- Use of copydoc for general function doc.
- Rename handbook chapter Fluid-Framework to Material and Fluid Framework
- Replace content from Chapter in Handbook by reference to Doxygen module
Thanks to Martin Beck for contributing!