that was necessary.
Had to fix some calls from the sax_parser. Easiest way was to add an
explicit conversion from input_position to size_t (that returns the
number of characters read). This strikes me as a reasonable approach
where lines are not relevant.
Now, there are unit test failures where parse_error strings are checked
against literals. Not sure I want to tackle changing all those :(
* Rename 'develop' folder to 'include/nlohmann'
* Rename 'src' folder to 'single_include/nlohmann'
* Use <nlohmann/*> headers in sources and tests
* Change amalgamate config file
