Fixed MSVS 2003, 2005 and 2008 tests execution by normalizing floating-point string representation using helper normalizeFloatingPointStr().

Fixed unit test failure on IBM AIX xlC by hard-coding the maxUInt64AsDouble as double constant instead of relying on double(Value::maxUInt64) which produces an incorrect value.

- Worked-around unit test failure with MSVS* by "forcing" all floating-point numbers to be loaded from memory instead of FPU registers.

in the past.

 *  isFoo methods determine exact representability.
 *  asFoo methods cause casting when safe.
 *  isConvertibleTo indicates whether casting is safe.

See NEWS.txt for details.

capabilities (and simplifying its implementation) in the process.

NEWS.txt for more details.

comprehensive.

isFoo methods.

correct in the process. (The test cases incorrectly used exact integers instead
of scientific notation.)