Remove acceleration from all buttons

[xaosfiftytwo]

• Rename python class bl-exit to Blexit
• Add main method to the class
• Create an Blexit instance and call its main method, without retaining a reference to the instance

[Hjdskes]

Looks good to me

[xaosfiftytwo]

@Unia, Good to know you are keeping on this. :)

[capn-damo]

This is above my competency level, so although I told John I would deal with the accelerators I think I'll let someone else merge it ;)

[ghost]

Code is reviewed (and tested).

[ghost]

Wrong button. Sorry. Stoopid eye-candy websites.

[johnraff]

bunsen-utilities version bumped to 8.6.5-1