Editing account names available

Last release did not have the ability to edit account names (only through a workaround). This release allows you to edit account names by double-clicking an account name, or by selecting it and pressing F2. There is also a minor bugfix in displaying the account name.

v0.4.5

• up to date with official PyBitmessage master
• integrated felidosz' new user interface
• lots of tiny user interface fixes and improvements
• integration of email gateways