Changed program icon file type to .ico file. Now there is no weird black background.
Added extra check to make sure that database is open.
Added central widget to mainWindow.
Added QVBoxLayout as _centralWidget's layout.
Got initials portion of main window put into layouts.
In process of adding checkboxes to layout.
All checkboxes added to main layout.
Got rid of unecessary checkbox setup functions.
Cleaned some stuff up and moved things around.
Added buttons to main layout.
Tweaked some things here and there.
Fixed layout of checkboxes a little more.
Fixed first-time startup initials bug, and changed SQLite functions to open each time... but still unable to open the same DB after closing.
Fixed first-time startup initials bug.
Merge branch 'master' into sql_integration
Fixed database issues -- now only open when needed, and can once again open the same DB after closing.