SpitAndPolish

This release includes many suggestions from users' feedback. I fixed a number of the issues with build warnings from cmake. I simplified some of the checks for whether things are installed on the user's system. I added tooltips and what's this. I added a help menu with useful links. I fixed a couple of typos, including in the PATH. And I added a check to see if the user is running as sudo. And I seriously improved the way the layout stretches.