Code cleanups

- Some code re-indentation
- Update the copyright years

Signed-off-by: Andrew Clayton <andrew@digital-domain.net>
Port to GTK+3

Convert the VAT text entry into a non-editable text view.

Signed-off-by: Andrew Clayton <andrew@digital-domain.net>
Restrict the number of decimal places from 1..6

6 decimal places is the most we'll get.

Signed-off-by: Andrew Clayton <andrew@digital-domain.net>
Display values to the number of decimal places requested

That is, if you want 4 decimal places don't display 6 with the last two
of 0.

e.g 84.3528 instead of 84.352800

Signed-off-by: Andrew Clayton <andrew@digital-domain.net>
gitignore: Add vi/vim's .swp files

Signed-off-by: Andrew Clayton <andrew@digital-domain.net>
vatmageddon 007

Signed-off-by: Andrew Clayton <andrew@digital-domain.net>