Log Message:
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