Merge pull request #44 from liske/master

Merge new config file format.
Merge pull request #45 from liske/master

Merge release preparations.
Merge pull request #46 from liske/master

Add info about new config file format.
Merge pull request #47 from liske/master

Merge recent fixes (build environment) and first part of man-page updates.
Merge pull request #48 from liske/master

Merge recent man-page updates and fixes.
Merge pull request #49 from liske/master

Merge recent changes.
Merge pull request #50 from liske/master

Merge final commits for v1.0.0.
Merge pull request #51 from liske/master

Fix kernel upgrade checks.
Merge pull request #52 from liske/master

Merge recent important bugfixes.
Merge pull request #56 from liske/master

Merge typo fixes.
Merge branch 'master' of github.com:DE-IBH/apt-dater