User Interface:
- Let user select smaller wavelength range than 10A!
- Clean up the mess with the cuts that influence the other windows, too
- Add WCS to spaxel coordinate display in spaxel viewer
- Let users do spectral arithmetic with the mouse, too (as it was before?)
- User preferences: window position, color table, and other stuff from
  "Configuration" menu

Bugs and possible bugs:
- DAR gives 100% CPU for a long time but no obvious result or other reaction
  => All DAR modes only seem to work for objects with bright continuum?
- hang after pressing "v" in pseudo-slit selected object
- Wavelength display after line fitting in top notification area is
  between 0 and 1 and not real lambda
- Sometimes the scale in the main window is overlayed by the RSS
- Sometimes on loading a file one has to press a mouse button or press Release
  to get a display (especially on imported cubes?)

Buildconfig wishlist:
- Redesign directory structure (no more extra obj dir, no more user/bin)
- Use "make install" instead of "install.pl"
- Redesign ./configure stuff to actually do something useful
- Version number at only one position in the codebase
- Link LCL as shared library and then link to that (minimize binary size)

