watch: Add no linewrap option

For long lines from a process, watch would wrap them around to the
next. While this default option has it uses, sometimes you want to
just cut those long lines down.

watch has a -w flag which will truncate the lines to the number
of columns. A few simple lines to do this new trick.

I think I caught all the ANSI state correctly but there might be
a chance it bleeds to the next row.

References:
 procps-ng/procps#182

NEWS

@@ -17,6 +17,7 @@ procps-ng NEXT
   * top: fix potential SEGV involving -p switch            merge #114
   * vmstat: Wide mode gives wider proc columns             merge #48
   * watch: Add environment variable for interval           merge #62
+  * watch: Add no linewrap option                          issue #182
 
 procps-ng-3.3.16
 ----------------