Move next/prevgroup, add togglegroup
update unit tests

grouptoggle -> togglegroup
whitespace fixes
When deleting a group, switch to previous group

...insted of the previous configured group.

Closes #304
Fix unit test
patch for iss300

Change the window's layout level behavior
When focusing on a window, bring it to front.
Floating(but not maximized or fullscreened) windows always on top.

Closes #300
Closes #302
Update CHANGELOG
fix AGroupBox.button_press()

Closes #306
swap up, down in stack mode
swap shuffle_up, shuffle_down in stack mode
Revert "swap up, down in stack mode"

This reverts commit 1cf859c1e5f5ec49899a8d003fef0eeeea0ae529.
stack split display order

change Stack.configure
python -> python2
make max stack transparent
above=True"," above=(c==s.cw)
use __len__ to avoid len(s.lst)
add stack toogle_maximize
reconfigure all window for max and stack, place all currentWindow on top(window.py)
mv bring focus to front patch code after the docs.
Change the window's layout level behavior
When focusing on a window, bring it to front.
Floating(but not maximized or fullscreened) windows always on top.