Do not create .dbvis folder in home dir on Windows

Currently dbvis creates a folder named .dbvis in my home folder on windows. You should *not* do this on windows. Windows has an AppData folder where you should store your application data. Since Vista it's split into Roaming (configuration which can be synced between all user's computers) and Local (configuration specific to just this computer). You should implement this, so that you don't pollute user's home directories. Here are microsoft's guidelines: http://msdn.microsoft.com/en-us/library/windows/apps/hh464917.aspx http://msdn.microsoft.com/en-us/library/windows/apps/hh465094.aspx