custom backspace

[Sam Halliday]

Hi all,

I'd really like an emacs configuration whereby backspace will go back one layer 
of indentation if the previous character is an indented whitespace, for all 
programming language modes.

Also, I'd really like control-backspace to be contextual so that it will eat up 
all the whitespace if the previous character is whitespace, or delete a word 
(which I think is the default) if the previous character is a non-whitespace 
character.

Can anybody please help me to get this set up?

Best regards,
Sam