Further needful edits to the README, focusing mostly on the first tutorial.
Changed references to README.pdf because of Inform bug 1068.
Removed extra address printing left over from the UI rework.
Removed catch tokens from the annotated call stack.
Removed spurious character from documentation.
Added paragraph break to clarify documentation.
Made the debug machinery capable of understanding unnamed phrases by their preamble, though at much expense to startup time.
Add parenthetical I7 names to I6 names for out-of-scope I7 variables in call stacks.