Fix dvtm.info: Set kbs to 0177 as in vt.c
cmdline: Add Delete Character (DC) handling
Handle write(2) errors correctly
Makefile: respect ${DESTDIR} in tic invocation
Fix insert-mode bug
Close pty upon destruction
dtvm.1: added keyboard command for pressing Mod twice
Place capabilities one per line in dvtm.info.
Remove unsupported capabilities from dvtm.info (flash, smkx/rmkx)
Shorten useless comments
Support multiple set/reset mode params
Fix typo in rs1 terminfo capability
Call doupdate() immediately before select() to reduce screen updates and terminal output.
Prevent cursor flicker when background windows receive data.
Clear the screen in redraw().
dvtm.c: parse_args(): needs 2nd NULL

create() tests args[2], which was causing a segfault
Replace clear_workspace() with erase().
Minimized windows should still be drawn in fullscreen layout

This reverts part of commit e3c9ff74 and makes sure that the cursor
is also shown if necessary.
Simplify draw_all
Save + restore cursor position when redrawing status bar