* Change JSON objects to a union type to use less memory
* Stop storing the string representation of JSON numbers
* Restore the ability to create features with large integer attributes
* Make sure large-integer feature IDs still behave as before
* Add missing #include
* Don't preallocate as much space for arrays and objects
* Treat inability to check free disk space as a warning, not an error
* Update changelog and version
An instance of catching an exception by value:
https://blog.knatten.org/2010/04/02/always-catch-exceptions-by-reference/
In jsontool, there's a warning about writing 8 bytes into a 7
byte buffer, potentially truncating or losing the nul-terminator.
There are a couple of instances of an unused bool variable, not
really a big deal.
Erica Fischer