Add hidden boards

Hidden boards are excluded from the board listing.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

board/context_processors.py

@@ -7,7 +7,7 @@ def settings(request):
 
 
 def boards(request):
-    return {"boards": Board.objects.filter(readonly=False)}
+    return {"boards": Board.objects.filter(readonly=False, hidden=False)}
 
 
 def reports(request):

board/models.py

@@ -63,6 +63,8 @@ class Board(models.Model):
     autosink = models.IntegerField(default=300)
     # Whether this board is read-only or not.
     readonly = models.BooleanField(default=False)
+    # Whether this board appears in the board listing or not
+    hidden = models.BooleanField(default=False)
 
     @property
     def threads(self):