Fix for Menu problem in #226

Qt’s menu imll appears to be buggy, it will disappear, and then show up
forever after switching back to the app. This deletes the menu when
it’s not in use in order to solve the problem.
Qt 5+ - Make Last column resizable (Qt looks terrible doing this)

The last column was fixed, probably because Qt does not react well to
having the last column resizable. Oh well.
Clarified label on constant containing difficulty change interval.
Custom shibeface

You can now place a pandacoin.png in the config dir, and it will show up
on the overview page.
Removed wallet upgrade code inherited from Bitcoin/Litecoin which does not apply to Dogecoin wallets.
increase OpenSSL version in build doc

this should fix the Heartbleed bug which affects rpc-over-ssl
Fix typo.
Fix border of wallet_bgcoin.png.
Update openssl for gitian.
Update qt for gitian.
Replace instance of bitcoin in /doc/release-process.md.
Throw out a bunch of trailing whitespace.
More updates for doc/release-process.md.
Pull in more updates for gitians.
Pull in boost as well.
This is just sloppy.
Fix a few images.
Appaend gitian to resulting zip.
Fix icons again.
More icon fixes.
Release v1.6.1.