fixed color coding in the daily planning

The list of colors used in daily planning shouldn't be random. There should be fixed list of colors (Geraldine will provide a list).

Color_codes_for_the_daily_plan.docx

created branch 163-fixed-color-coding-in-the-daily-planning

mentioned in merge request !79 (closed)

mentioned in merge request !80 (merged)

closed via commit 15cb25be

closed via merge request !80 (merged)

changed milestone to %v0.9.0

mentioned in commit 15cb25be