Add abbrev
Keybinding for switching frames
Update filters to change in internal backend representation
Typo fixes and cosmetic changes
Rearrange file
Add sa-transpose-lines

This behaves mroe naturally than what is provided by Emacs.  I think
that is because how `transpose-subr' behaves.
Frame navigation and transpose bindings

- Buffer navigation is C-x <left/right>, so frame navigation is C-x
  C-<left/right>.

- Line/paragraph navigation is <up/down>/M-}, so line/paragraph
  transpose functions are C-<up/down>/C-x M-}.  -ve argument for
  paragraph transpose does not have special binding since the default
  behaviour is reasonable.
Remove some abbrevs