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Bug #870515: Change Int to Num

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1332. By Matt Giuca on 2012-01-05

doc: Replaced all textual references to integers with references to numbers.
Updated some parts (such as the tutorial) to show non-integer numbers.

1331. By Matt Giuca on 2012-01-05

doc: builtins, prelude: Added mention of error conditions regarding non-integral inputs to functions that expect integers.

1330. By Matt Giuca on 2012-01-05

test_builtins: Added an error test case, calling error with a fractional number.

1329. By Matt Giuca on 2012-01-05

doc toplevel: Describe how the result of main is converted into an int.

1328. By Matt Giuca on 2012-01-05

test_bignum: Rewrote the tests to test the limits of floating point requirements.
This has four distinct tests: big (largest precise integers), huge (largest values), small (smallest precise values between -1 and 1) and tiny (smallest nonzero values).
All pass.

1327. By Matt Giuca on 2012-01-05

test_builtins: Removed test_arithmetic_bignum and test_arithmetic_overflow.
These are no longer relevant given that we use floating point; they were failing because the floating point has a smaller range than bignums.
Overflow is now undefined behaviour, so we do not test it.

1326. By Matt Giuca on 2012-01-05

doc/values: Describe the guarantee that a certain precision will be available for all numbers between -1 and 1.

1325. By Matt Giuca on 2012-01-05

doc exprs: Fix reference to num_literal_expr (was: int_literal_expr).

1324. By Matt Giuca on 2012-01-05

Case switch-intlit: Added float literal tests as well.

1323. By Matt Giuca on 2012-01-05

Merge from trunk (allow negative intlit patterns).