vt emulation
------------

* implement BCE right
* color definition in CSI
	* implement CSI parsing
* make the keypad keys really work
	* kf0 .. kf44
	* kend, kel, kent, kfnd, ked, kext
	* kNXT, kPRV
	* ka1, ka3, kb2
* add arrow keys handling

code & interface
----------------

* clean selection code
* clean and complete terminfo entry
* add border around cursor, when it could be hard to read
	* white border when not selected would suffice
	* + definition in config.h

bugs
----

* handle XOpenMI() errors
* fix shift up/down (shift selection in emacs)
* fix selection paste for xatom STRING
* fix umlaut handling in settitle
* fix rows and column definition in fixed geometry
* clear the borders of the st window, if something has drawn on it

misc
----

    $ grep -nE 'XXX|TODO' st.c