* First implementation.
* PORT BACK: fixed a few flaws (fixed-width side panel ..)
1. On "save as" the filename displayed in the cell view selection box
was not updated
2. The width of the library and cellview panel could not be reduced
below the width of the combo boxes in the headers. So the
panels might have become pretty wide without being able to reduce
them.
* Implemented #560 (multiple techs on libraries)