Update misc/dvtm to dvtm-0.14.

Changes:
* nmaster functionality available via MOD+{i,d} i.e. the possibility
  to change the number of windows displayed in the master area
* "urgent flags" that is if an application issues a bell \a the urgent
  flag is set and the corresponding tag will blink
* distinguish between return key and new line this fixes the behaviour
  of CTRL+j in certain applications
* rudimentary support for the \e[?10{47,48,49}{h,l} xterm sequences
  to switch between alternate and normal screen buffer as used by
  >= abduco 0.3
* better Unicode support in the statusbar
* the current layout symbol is displayed in the tag bar
* the position of the status/tag bar is runtime configurable via MOD+S
* code cleanups and fixes from static analyzers
* DragonFly BSD support

(leot)