UI changes (again)

Hi, sorry to bug you again. This is a new version with similar UI changes to before. I've changed the styles and the layout files only--no Java changes. I really like KeePassDroid, but the fonts are so small and hard to read. Feel free to merge these if you want. I'd really like to also set it up with a font that distinguishes more strongly between 0 and O, if you have any ideas.