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This is a large overhaul of monkey code. Before, only edits within
individual lines were tracked, which required a Prolog-specific method
for splitting a program into a list of lines for every rule. In this
version, modifications can be tracked within arbitrary code ranges.
Ranges to be tracked are determined by selecting "interesting" subtrees
in the AST of the starting code version.
The new method is simpler, less language-dependent and easier to extend.
The downside is that a program must be syntactically correct before we
can attempt to fix it (the previous approach could handle programs with
syntax errors in some cases).
This commit also integrates a call to monkey.fix in prolog_session.hint,
by running it if no other hint is found.
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