SciDAVis - Improvements SciDAVis Copy

- Replaced news import via deprecated and broken SF.net interface with a simple RSS adapter.

- Added missing license note to globals.cpp.

- Added copyright/license header to files written by Ion Vasilief, after
consulting him on the matter. Compare QtiPlot r1656.

- Removed unused file resource.h.

- Added copyright/license header to some files written entirely or primarily by me.

- Update of Czech translation by Pavel Fric.

- Cleaned up build system. Added options for disabling some features which are
frequently undesirable when integrating SciDAVis in a Linux distribution,
such as checking for updates. Added presets for common setups (end user
installing from source, packaging, self-contained binaries) which can be
selected on the command line (e.g. "qmake PRESET=linux_package") without
having to edit/patch a configuration file.

- Changed link for Slackware packages (until linuxpackages.net gets updated again...).

- Fixed incompatibility with Qt < 4.5

- Simplified process of building SciDAVis on Windows.