Since current Howm in melpa does not have 'howm-cl-remove-if', we should use 'cl-remove-if'.
A deadline item followed by NUM should be displayed on the calendar from NUM days before the deadline date. For example, [2017-06-20]!3 should be displayed as a period 2017/06/18 - 2017/06/20 instead of 2017/06/20 - 2017/06/22.
This PR contains 2 commits:
Since current Howm in melpa does not have 'howm-cl-remove-if', we should use 'cl-remove-if'.
A deadline item followed by NUM should be displayed on the calendar from NUM days before the deadline date. For example, [2017-06-20]!3 should be displayed as a period 2017/06/18 - 2017/06/20 instead of 2017/06/20 - 2017/06/22.