Move tab creation to its own subroutine.
Move data unique for the tab to the document.
Cleanup.
Better management of new file content.
Replace with new data instead of appending.
Enable starting with no argument.
Get a date for the file.
Show the date in the tab label.
Use a short string on the tab name.
Use the full string in the status bar.
Change focus to the new tab.
Fix #7: Date in title (previous commit).