test
indluce dfv.dev function in exported functions
details added for installation instructions, still needs more work though
several updates to base engine:
 - auto load and auto save of GUIs fully implemented
 - makeGUI as cach all GUIElement method added
UML diagram for the dfv added
savePlotDialog expanded as example of modal dialog that returns data
ModalDialog introduced as base class for modal dialogs
for easier development, export all variables at the moment
uml diagramm updated (modalDialog added)
protected settings introduced
working on saveplot dialog (filename and extension added)
save plot dialog finished and fully implemented
save message added
setting up menu and toolbar for all intended functionality
RDataTable outline added:
 - capable of making table
 - hiding invisible columns
 - enabling sorting
 - querying selection
 - selecting rows
Merge branch 'v1.0' of github.com:sebkopf/dfv into v1.0
implemented saving data frame into workspace file
DataTable update:
 - test function added
 - gtk objects moved from widgets into table
added test for remaking table
Data Frame renamed to DataElement to avoid confusion