I made some changes.(Also forgot to include "Disabled HISTORY download")

The stupid number of commits(5) is from my own stupidity. This is what I did:
1) Added a bitcoin icon. 2) Changed windows startup script. 3) Changed
Order Book Layout to: Not Show any USD volumes, just show Price(USD),
Size (BTC )& Total Sum(BTC). Ignore all small orders (Below 0.6BTC and
cumulate them into the next line with a volume weighted average price).
Make the Price column 5 Decimals 4) Make Buy/Sell Price EditBox 5
decimals  5) Make Minimum Window Size able to be resized MUCH smaller:
UI Changes: Font size smaller on some things 6) Disabled HISTORY download.
7) Add a new screenshot of the changes.

Now I know this is a drastic change to the order book but I was requested to do this by someone and I agree with the way I did it. Seeing USD Values of $99,000 or $912,110 really don't help me. And it may be way harder to implement/split-off the "ignore BTC below 0.6" code from the "remove USD values" code. So you can do whatever with this pull request. But this is the version that i'm using.  I also had a few other icon choices, but they were REALLY bad (like the mtgox logo was unreadable), so i finally just decided on the generic bitcoin logo. And I made changes to both the main_window files because I was just editing them directly, not using the QT IDE or whatever you used. I'm gonna start to get into GUI programming soon and maybe we can work together on stuff. Also I'm going to keep adding features that I can easily program into your code.  The history download is quite large, half a meg or so compressed... so its not useful to download this everytime in the current form of the program. So i disabled it in the goxtool.ini file.