issue7120:
- added "Copy Absolute XPath" to context menu
issue5724: Limit command history
Issue 7144: DebuggerLib.getInactiveDebuggeeGlobal can provide debuggers from a destroyed context

https://code.google.com/p/fbug/issues/detail?id=7144
Issue 7145: getEventListeners includes the HTML panel mutation observer

https://code.google.com/p/fbug/issues/detail?id=7145
Don't reset the shortcuts immediately but when the shortcuts dialog is
closed
Issue 6941 (Ctrl+Shift+C launches Firefox devtools' inspector instead of
Firebug's one)
http://code.google.com/p/fbug/issues/detail?id=6941
Put disabling existing shortcuts into its own function (related to issue
6991)
Put Firebug shortcuts into their own keyset
Disable existing browser shortcuts after Firebug extension activation
Revert shortcuts to defaults when Firebug extension is disabled
Issue 6991 (Ctrl+Shift+C conflicts with Firefox DevTools' Inspector)
http://code.google.com/p/fbug/issues/detail?id=6991

React to the "devtools-loaded" event to override global shortcuts
Store the disabled shortcuts in the chrome window instead of
BrowserCommands to allow resetting the shorcuts to the defaults
Merge branch 'issue6991b'
issue7120:
- Copy (absolute) XPath is always available now
- Copy Minimal XPath is only available if it's different as absolute
issue7120: improved coding style
issue7120:
- fixed function names
- fixed translations
Merge pull request #116 from kaljak/issue7120

Issue7120:  Absolute Xpath
Merge pull request #117 from kaljak/issue5724new

Issue5724: Limit command history