New version of Wfkviewer based on tabs.
 Move abiopen.py to scripts directory.
 mdfviewer + support for multiple GSR files in gsrviewer
 Fix typos.
 Use relative paths for the directories in FileListPanel.
 Minor changes in GUIs
 Ignore wxmplot import errors (again)
 Add abstract base class for Viewers
 Made all viewer frames inherit from MultiViewerFrame
 Put font picker in the tool bar instead of inside the panel!
 Add kpoints panel
 Code cleanup
 Add dialog for sending bug reports.
 New version of KpointsPanel
 Add support for Cut&paste
 Add popupmenu to SpinKpointBand Panel
 New menu option for plotting bands with edos