Add countdown display to the /dev/null front page

Implemented with JS using http://hilios.github.io/jQuery.countdown/
plugin.
Added /dev/null/nethack 2014 to sources
Merge branch 'master' into devnull

Bring in /dev/null/nethack logfile
Missing space
Enabling real-data /dev/null 2014
Add /dev/null links to NHS pages
Fix small regression in Recent/Ascended display

Columns Server and Variant were not displayed
when devnull processing was enabled.
Fix for JS countdown not display days properly
Change /dev/null front page message
Add new substitution %x to url_substitute()
Fix for incorrect links to player pages

Devnull games had incorrect links on main NHS pages
(Recent and Ascended pages, maybe some other, too).
Fixed by adding extra argument to row_fix() that
indicates a /dev/null game.