Use iterators in Line::erase() and Line::insert().
Implemented ECH
Implemented SU and SD.
Make 2x methods const in buffer.hxx
C++11 auto
Fix bug where selection on first line wasn't rendered.
Adjust line-breaks.
Use C++ casts
Adjust Cell static constructors.
Adjusted signature of Terminal::translate()
Make cs/g0/g1 stuff work. Also changed to lowercase.
Make NYI not a DO_ONCE in debug mode.
Stylistics
Don't print dedupe percentages.