new directory structure

restructure some gtk callbacks

set image position in cartesian coordinate system

test cases for export and preview

remove some dead code

output directory option for birdfont-export

improved is over test case

merge paths

calculate bounding box only for on curve values

look up name in kerning tab

testcase for quadric path conversion

export quadratic bezier paths

add a scrollbar and some new scrolling code in OverView

validate headtable, test FontData class and remove some debug code in ttf writer

test case improvments