reflow to fill-column 77

and add comment informing your text editor that fill-column=77
Change python.org link (https, main download page); editing.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
1901 - Fix Welcome Page

Solution was very simple to implement, no content disposition header was
necessary.
Tested with both Firefox and Chrome, using binary image file stored in
folder, as well as with text data using LIT cap.
Merge pull request #112 from Lcstyle/master

Fix 1901 - the "Download!" button on the Welcome page leads to the file displayed in-browser instead of downloaded/saved.