Task #867: Update Doxygen documentation for C++ code
Add/update Doxygen documentation for src/gromacs/trajectoryanalysis/
There is a significant amount of comments in these files, but many of them are outdated because of recent changes.
Improved Doxygen docs for trajectoryanalysis/.
The public API is now documented at some level, but a lot still remains
to be improved.
More comments for trajectoryanalysis.
- Added/updated/made more uniform Doxygen comments for general classes
in the trajectoryanalysis subdirectory.
- Removed an unnecessary method to avoid copying documentation for it.
- Removed some commented-out code.