mscgen-0.20-bp154.1.24

- update BuildRequires list to fix build failure:
  * remove libpng12-devel
  * add fontconfig-devel, libX11-devel and libXpm-devel

- Edited %files to clear unpackaged files builderror in
  openSUSE:Factory

- specfile overhaul
- ran spec-cleaner

- Updated to 0.20

- Updated to 0.13:
  New features: improved label quoting.

- Updated to 0.12:
  New features: arctextcolour, arclinecolour, textcolour,
  linecolour (#rrggbb values, or the 16 HTML names), double lined
  arcs, width, arcgradient.
- Added check section

- Initial packaging