Backspace should delete beyond the start of the insert mode

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Press i or a in the middle of the text.
2. Try pressing backspace.

What is the expected output? What do you see instead?
On Vim with ":set bs=2", the backspace key deletes any character, regardless of 
where the insert mode was initiated.
On jV and on original Vi, that is not true, and that is very annoying.

Either jV should hard-code "bs=2", or it should add support for options and 
then add the 'bs' option.

What version of the product are you using? On what operating system?
jV 0.53 for Chrome 17.0.963.38 beta.




What steps will reproduce the problem?
1.
2.
3.

What is the expected output? What do you see instead?


What version of the product are you using? On what operating system?


Please provide any additional information below.

Original issue reported on code.google.com by denilsonsa on 23 Jan 2012 at 9:04