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Updated the table back-end to properly initialize the position in the sentinel cell at the bottom of the stack.
This requires changing the function [start] in the incremental API to take a position.
Updated the doc and demos.

For the modules in MenhirLib, adopt the convention that the first letter of the file name must be capitalized.

Modify [Engine] to give access to the positions of the lookahead token.
  Use a tainted dummy position to help debug.

Defined the type [stack] as an abbreviation for [element stream].

  (Not great, but they don't deserve a separate module yet.)
Updated Printers and Calc.

  This removes the need for the exception [Accept].
Modified the table back-end to include the number of start productions
  as part of the generated tables.

The type env no longer needs to be parameterized.
This makes the API safe (and simpler).
There a slight runtime cost (e.g., from 4.6s to 4.7 seconds).

This seems to cause roughly a 10% speed loss (e.g. from 4.3 to 4.6 seconds).
The current interface is not satisfactory, as it allows the user to
manufacture a continuation that will break our invariants and lead
to a crash.

[lr1state], [element], [stream] and of the function [view].

in the special case where the language is empty or {epsilon} is now fixed.

This removes two eta-redexes.
The speed difference is barely measurable, maybe 0-5%.

This costs one more field in the [env] record.
The speed difference is actually not measureable.
Maybe it would be measureable in an application where the [env] records
  are stored and move to the major heap. Never mind.

to artifically cast [offer] and [handle] to a more general type.

Added a phantom type parameter to the type [env] so as to prevent
the user from confusing [offer] and [handle], thus eliminating a
runtime check, while keeping the ability of offering functions that
operate on an arbitrary environment (such as stack inspection).

every step of error handling. Compared to Frédéric's patch, this
code is "more incremental" in that the parser will try to handle
the error, pop one cell, suspend itself, try to handle the error,
pop one cell, suspend itself, etc. In other words, *every call*
to [error env] has been replaced with [HandlingError env], whereas
in Frédéric's patch only 2 out of 3 calls were replaced.

For convenience, this is done using [match/exception].
As a result, ocaml 4.02 is required.
Updated the Makefile to reflect this requirement.

The first token is now read during the first call to [run].
This exchanges the order of the first two messages in the trace,
but is actually more regular.
In the code back-end, this fixes a "bug" in the case where the grammar
accepts only the empty word. In the table back-end, the bug is not yet fixed.

Replaced the call to [read] with returning an [InputNeeded] result.

I see a 5% performance gain, from 2.0 to 1.9.
If we could remove the tests altogether, we would go down to 1.8.

The ratio table/code seems to be back from 2.1 to 2.0.