nPlot 0.4.9 released

After over a year of development, I'm pleased to announce release of nPlot 0.4.9.

Changes:
* Switched to libxml for loading/saving session files
* Preliminary plugin support
* Partial migration to GNU gettext
* Ability to use various data types; expandable through plugins
* Fixed saving and loading zeroline state

Again, please note, that project files saved with older versions will not work with this one.

To avoid any problems, binary packages (.deb and .rpm) are statically linked with cairo 1.6.4 and Qt 4.3.4. As usual, Windows package will be available later.