fixed comments and the description of the user guide

add the tag-documentation files for the new case

Keeping it in same concise style as before, sure all
of that docu needs a heavy upgrade.

PVCDBC = PrimaryVariableConstraintDirichletBoundaryCondition.

Change of OGS version only affects frontpage and navigation tree.
The navigation tree is a single html embedded into every page.
This helps in better CDN caching and faster uploads on Netlify.

Dmitri Naumov authored 4 years ago and Lars Bilke committed 4 years ago

Move individual text snippets in single place.
Use \copydoc elsewhere for project tags.

Lars Bilke authored 4 years ago and Dmitri Naumov committed 4 years ago

Can be used inside a project file similar to the glob expression
in AddTest() (CMake). If the regex-parameter is present, the `file`-
parameter is ignored and can be omitted.

Add forgotten braces in MPL::Exponential and MPL::Linear properties.