Support --columns 0 which disables column limiting

The lack of this feature appears when piping bugz output, which produces
unexpected results even without specifying a column limit.

Signed-off-by: John Helmert III <[email protected]>
Closes: #110
Signed-off-by: Arthur Zamarin <[email protected]>

Author: ajakk

bugz/cli.py

@@ -94,7 +94,7 @@ def list_bugs(buglist, settings):
             line = '%s %-12s' % (line, severity)
         line = '%s %-20s' % (line, assignee)
         line = '%s %s' % (line, desc)
-        print(line[:settings.columns])
+        print(line[:settings.columns] if settings.columns else line)
 
     log_info("%i bug(s) found." % len(buglist))