changed version number to dev
add some menu shortcuts
fix menubar problem on Mac OS
add statistics and plot for modifiers
add independent variables features
continued to add independent variables features
small fixes to observations list
add optparse module
move time budget and diagram widget in module
code refactoring
code refactoring
lot of changes
bugs fixed and features added
first commit
first commit
first commit
first commit
first commit
fixed bug when time offset is negative
add version date to about window