- Systematize colors and make them user adjustable. See documentation for details.
this requires the \moderncvcolor to be issued BEFORE \moderncvstyle.
- all styles: make the head options 'details' and 'nodetails' available to the user.
(previously they were hidden). Olystyle does not respond too well to nodetails.
- Avoid an unnecessary empty line in body 3 when both the company name and date range are empty, enabling one to stack roles at the same company
- Avoid an unnecessary empty line in head 3 when no details (address, phone number, etc.) are provided
