Merge branch 'release/v0.2.0' into development

* release/v0.2.0:
  polish up release notes
  examples: scalar: a few little cleanups
  removed const keywords in scalar_sweeper; they should be there, no idea why it worked even with them
  more documentation for scalar example; added mathjax directives at multiple points
  improved docu for scalar example; added ** at several points
  extended documentation for scalar example
  docu: extending/fixing/cleaning docu for upcoming release
  some enhancements of the coverage generation script
  fix for aggegrated coverage results
  cmake and tests: enable and provide test coverage analysis
  cmake: add option for GCC profiling
  sweeper: incorporate @memmett's remarks
  exceptions must be thrown to be effective
  some code formatting tweaks
  docu: some docu on IMEXSweeper::predict
  encap: some templatization tweaks
fix DOI vor v0.2.0
Merge branch 'development' of github.com:Parallel-in-Time/PFASST into development
Merge branch 'development' of github.com:Parallel-in-Time/PFASST into development