fix scandata creation bug
remove import
remove sleeps in timeout loop
add plain text derive option
refactoring
fix/cleanup imports
refactoring
fix gui threading -- use only gobject (rather than Gdk.threads_...) and init gobject threads before main
minor doc string formatting changes
minor whitespace changes
add doc string
fix book start_time bug
minor fixes + fix full plain text derive
add doc strings
add doc strings