Fix python meta data generation

Summary

Several smaller changes to improve python meta data handling, see dune-grid#141 (closed).

Main changes

• Move set(<module>_FOUND 1) to the end of dune_project()
• Add set(HAVE_<MODULE> 1) at the end of find_dune_project() to provide the "dune-way" of indicating found packages
• Collect all HAVE_<MODULE> flags for all dependencies in the python _cmake_flags variable

assigned to @simon.praetorius

marked this merge request as draft

added 4 commits

• fa3dd8f6 - [cmake] define HAVE_{module} flags to check during cmake
• 780e2570 - [cmake] automatically add all found dependencies and suggestions to meta data
• 2bf8f9d5 - [cmake] automatically add DUNE_OPTS_FILE to python meta data
• be60661c - [cmake] define HAVE_${ProjecName} already during initialization

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marked this merge request as ready

mentioned in issue dune-grid#141 (closed)

There are some changes I have to test carefully. The changes might have consequences in other places than just the python meta-data.

mentioned in merge request dune-grid!560 (merged)

added 1 commit

• f9ae18eb - [cmake] properly check for defined variable

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added 1 commit

• b191b5ea - [cmake] set _FOUND at the end of dune_project

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added 1 commit

• e1b8287c - [cmake] set ${ProjectName}_FOUND at the end of dune_project

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resolved all threads

Since these are just a few related changes, the commits should be squashed to max. 3 or squshed automatically on merge.

changed the description