Fix some typos, clarify some things, and replace a slightly incorrect
pair of PNGs.
Some of the dialogs have gained additional options, but the changes
aren't meaningful enough to warrant taking lots of screen shots.
Two main changes:
- "Seek nearby targets" is no longer enabled by default.
- The application asks the user to save new projects immediately.
Various minor edits were also made.
A couple of the images are slightly stale, showing ".org" rather than
".addrs", but they're in the advanced section and the difference
isn't notable.
Added a "format help" button to the long comment edit window. This
brings up a quick summary of the format tags in a modal dialog.
Updated documentation and tutorial.
Biggest changes were to the address region handling in Tutorial1
and the use of StdInline.cs for the inline strings in Tutorial4.
Also, fixed the off-by-one error in Tutorial1.
