Release 7.0 (#721)

* update authors

* update documents

* update developer's guide

* update documentation

* update documentation

* update doc

* update documents

* update

* Update release_notes.tex

* update release notes

* Update developer's guide

* Delete #PsPM_Developers_Guide.lyx#

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Co-authored-by: Bernhard <90285552+4gwe@users.noreply.github.com>
Co-authored-by: Dominik Bach <dominik.bach@gmail.com>

Author: 3 people