JSON is read as text, so line endings should be preserved.

This reverts commit 32cd8212.

Closes GH-42.

Transform serial key comparison from substraction to real comparison.
Reset serial to zero in json_object_clear() to avoid it growing out of
bounds when reusing objects.

Closes GH-40.
Closes GH-41.

Fixes GH-39.

Don't output any DOS line terminators from json_process.

Issue GH-39.

Fixes GH-38.

For maximum compatibility.

For maximum compatibility.

Move the multithreading-and-setlocale documentation to the new
portability chapter.

Fixes GH-36.

Replace isxxx() functions from ctype.h with locale-independent macros.

Fixes GH-35.

The decimal point '.' is changed to locale's decimal point
before/after JSON conversion to make C standard library's
locale-specific string conversion functions work correctly.

All the tests now call setlocale(LC_ALL, "") on startup to use the
locale set in the environment.

Fixes GH-32.

This way we can check for JSON_ENCODE_ANY flag in one place only.

Little fixes

Fixes GH-31.

Fixes GH-30.

Fixes GH-29.

While at it, reword the object iteration protocol description a bit.