Documentation: Manual structure and markup

.. but no content or images yet.
Documentation: Manual fixup and Makefile

.. and added raw PDF with no content.
Fix Sidebar multicalendar refresh bug

.. it didn't refresh properly when a ride was added
removed or edited

.. also fix a double update call, so its a bit snappier
now.
Fix multicalendar repaint bug

After taking out the double refresh in the previous commit
we got a bug with the last selected date stating highlighted
when clicking on the left and right buttons.

Fixed by signalling date changes after the model has been
queried. Still lots faster than before.
UI Nits: Splitter menu button sizes

.. made toolbar larger and icons larger.
Documentation: Manual images sorted

.. example on the cover page of the manual

.. we need them to follow a naming convention
   if section-keyword.pdf, e.g. 0-icon.pdf for
   the icon on the title page (section 0).