[Tilesathome] Signal handler for tilesgen in loop mode

[Scott Walde]

This patch adds a signal handler to tilesGen.pl that gets enabled in 
loop mode.  It traps SIGINT (ctrl-c) and increments a counter.  The loop 
mode "while" loop is changed to read while($sigintcount==0) instead of 
while(1).  The handler will exit immediately when $sigintcount == 3.  
The end result:

In loop mode, a single Ctrl-C will cause tilesGen.pl to finish the 
current tileset, then exit.  Three ctrl-cs will exit the program now 
with no cleanup instead of finishing.

This is a scratch I've been meaning to itch for a while, but only got 
around to it today.  I hope you find it useful.

Legalese:  This patch is licensed with the same license as tilesGen.pl.

ttyl
srw


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