Beta 0.7.0 released

The main features of this release are:

* Drag and drop between almost everything. Unfortunately, the drop to another program under win32 doesn't work at present time, as it is not yet implemented in the win32 port of GTK+.
* Theme and font management (skins).
* Advanced log management: much more events are commented and a log file is written.

This release was ready three weeks ago but we haven't any central server. Moreover, the current one can be unstable.