Remove HexHoles generator

as it is superseeded by the HolePattern generator which does more and
does better.

boxes/generators/hexholes.py

@@ -1,36 +0,0 @@
-#!/usr/bin/env python3
-# Copyright (C) 2013-2016 Florian Festi
-#
-#   This program is free software: you can redistribute it and/or modify
-#   it under the terms of the GNU General Public License as published by
-#   the Free Software Foundation, either version 3 of the License, or
-#   (at your option) any later version.
-#
-#   This program is distributed in the hope that it will be useful,
-#   but WITHOUT ANY WARRANTY; without even the implied warranty of
-#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#   GNU General Public License for more details.
-#
-#   You should have received a copy of the GNU General Public License
-#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-from boxes import *
-
-class HexHoles(Boxes):
-    """Hexagonal pattern of holes for ventilation"""
-
-    ui_group = "Holes"
-
-    def __init__(self):
-        Boxes.__init__(self)
-
-        self.addSettingsArgs(HexHolesSettings)
-        self.argparser.add_argument(
-            "--width",  action="store", type=float, default=100.,
-            help="width of the hole pattern (in mm)")
-        self.argparser.add_argument(
-            "--height",  action="store", type=float, default=100.,
-            help="height of the hole pattern (in mm)")
-
-    def render(self):
-        self.hexHolesRectangle(self.width, self.height)