Introducing the real Eyepiece View! (Eyepiece View is no longer Beta)

Eyepiece View is now powerful, well-featured and usable! This minor
commit removes (Beta) from the description.

There still are some bugs (it sometimes resets the map field of view
and focus, for unknown reasons), but the feature is otherwise mostly
functional, usable, and powerful.

Here are the newly introduced features in the last series of commits:

1. SVG rendering of the sky map on a larger bitmap, and smooth
   transformations for excellent sky-chart quality.

2. Choice of Field of View from a drop-down menu, after which the map
   is cropped to precisely the chosen FOV.

3. Appropriately scale DSS image based on meta-data to match the FOV
   size.

4. Appropriately rotate the DSS image to match the orientation of the
   eyepiece field if one is using Alt-Az mode (where the Zenith is up
   as opposed to the North Pole)

5. Allow overlay of DSS behind the sky map (the transparency is a bit
   of trickery, and doesn't work well with bitmap stars for good
   reason)

6. Presets that come into effect when the dialog is freshly opened, or
   when the user choses them. The presets are right now simple, but
   the planned extension is to include the field-rotation for
   Dobsonians, see-through refractors, Newtonian equatorials, and any
   telescopes that have predictable eyepiece position (i.e. don't have
   an eyepiece rotator or rotatable erecting prism)

Screenshot: http://wstaw.org/m/2016/01/06/Screenshot_20160106_054001.png

CCMAIL: kstars-devel@kde.org
DIGEST: The Eyepiece View feature in KStars is now powerful and usable