added documentation to new-cafe
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#|procedure:new-cafe
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synopsis:
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(new-cafe [eval])
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description:
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The procedure new-cafe starts a new read-eval-print loop inside
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the current cafe (if one exists). It prompts the user for an
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expression, evaluates it, prints the result back, and repeats the
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process. If new-cafe is called with an argument, eval, then that
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argument must be a procedure that takes a single argument. The
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eval procedure will be used to evaluate the expressions.
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Every time a new cafe is started, the prompt is changed to reflect
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the depth of the current cafe (i.e. how many eof objects is takes
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to exit the outermost cafe).
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Input and output performed by the cafe can be changed by the
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console-input-port and console-output-port parameters.
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If an error occurs during reading, evaluating, or printing an
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expression, then the error is printed to the error-port and the
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operations of the cafe resume as normal.|#
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#|FIXME:new-cafe
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Be specific about what the error-port is |#
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(let ()
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(define with-error-handler
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(lambda (p thunk)
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