work in progress for simplified redesign of our text buffer classes
much simplified and mostly working revised data structure and methods
get line inserts working properly and hook _write_temp up
jumps work and catch exceptions properly
straighten out insert vs. append
don't forget to update line_number when we insert or append for the first time
more refactoring - still broken
clean up stubs
clean up interfaces and use slicing for insert/append
fixes for pylint
pylint fixes
update status and roadmap
Merge pull request #3 from DerekMarshall/refactor_ex_buffer

Refactor ex buffer