Fix #418 - Checked also -1 to display singular values.
Fix #421 - Notifications only display if minutes should be changed and corrected graphical defaults.
Merge pull request #420 from vreixo/issue418

Fix #418 - Checked also -1 to display singular values.
Fix #421 - Rounded minutes depending on seconds.
Fix #421 - Corrected delays to modify hours and improved check to don't display if same hour instead of same delay.
Merge pull request #422 from vreixo/issue421

Fix #421 - Notifications only display if minutes should be changed and c...