No changes to the actual library code.

Provide an example usage pattern for reference stealing functions.
This way the user (hopely) sees more clearly how the reference
stealing functions are meant to be used.

When encoding an array or object ends in an error, the visited flag
wasn't zeroed, causing subsequent encoding attempts to fail. This
patch fixes the problem by always zeroing the visited flag.

Encoding an empty array or object worked, but encoding it again
(possibly after adding some items) failed, because the visited flag
(used for detecting circular references) wasn't zeroed.

Conflicts:
	CHANGES
	configure.ac
	doc/conf.py

Conflicts:
	configure.ac

The AC_TYPE_INT32_T macro first appeared in autoconf 2.60.

Use AC_C_INLINE autoconf macro, include config.h where needed, and add
a define of JSON_INLINE to jansson.h that has the correct "inline"
keyword.

Thanks to Deron Meranda for providing the initial text.

Earlier it was a decoding error.

Initialize their reference counts to (unsigned int)-1 to disable
reference counting on them. It already was meant to work like this,
but the reference counts were just initialized to 1 instead of -1.

Thanks to Andrew Thompson for reporting this issue.

the missing 'inline' leads to duplicated symbols if the header is
included into two separately compiled files.

This should have fixed by commit 28682322, but there was one #include
left in utf.c. It now includes utf.h instead of stdint.h.

With this encoding flag, the object key-value pairs in output are in
the same order in which they were first inserted into the object.

To make this possible, a key of an object is now a serial number plus
a string. An object keeps an increasing counter which is used to
assign serial number to the keys. Hashing, comparison and public API
functions were changed to act only on the string part, i.e. the serial
number is ignored everywhere else but in the encoder, where it's used
to order object keys if JSON_PRESERVE_ORDER flag is used.

If a key already exists in the hashtable, use the existing pair
changing its value instead of removing the old one and allocating a
new pair.

When the property already exists in the object, we can store an
iterator pointing to that property, instead of duplicating the key.

When the property (key) is not present in the object, we still have to
duplicate the key.

If a user happens to store an ElementProxy or a PropertyProxy
instance, we need to take a reference to the JSON value they point to.
With PropertyProxy, the key needs to be copied as well.

Use AC_TYPE_INT32_T and include inttypes.h (if it exists) instead of
stdint.h for maximum portability.

Conflicts:
	LICENSE

It reads an input file, and the file location is different with VPATH
builds. Read top_srcdir from environment and use it to find the file.

Value::save_file -> Value::dump_file
Value::save_string -> Value::dumps
load_string -> loads

This is to avoid standard C functions ending up in namespace json, as
jansson.h is #included in there, and jansson.h in turn #includes
stdio.h.