Patch Improvements

[dfsuther]

There are a bunch of "un-Mac-like" things in Dom III as currently implemented. Here goes:

• Right-click is currently implemented as command-click, but it should be control-click to match the Mac standard.
  
• Multiple selection is control-click, but it should be shift-click for contiguous selection or command-click for non-contiguous selection.
  
• Clicking in a scroll-bar below the thumb should scroll down; above the thumb should scroll up. Neither does anything ATM.
  
• Page-up and page-down should cause scrolling lists to scroll by one page, but does not.
  
• up-arrow and down-arrow should cause scrolling lists to scroll by one line. They don't.

And of course, there's the one all-important non-bug: It runs on the Mac!