Problem:    Various small problems in source files.
Solution:   Fix the problems.

Problem:    When decoding JSON with a JS style object the JSON test may use a
            NULL pointer. (Coverity)
Solution:   Check for a NULL pointer.

Problem:    JS style JSON does not support single quotes.
Solution:   Allow for single quotes. (Yasuhiro Matsumoto, closes #1371)

Problem:    Modelines in source code are inconsistant.
Solution:   Use the same line in most files.  Add 'noet'.  (Naruhiko Nishino)

Problem:    jsonencode() is not producing strict JSON.
Solution:   Add jsencode() and jsdecode().  Make jsonencode() and jsondecode()
            strict.

Problem:    json_test fails without the eval feature.
Solution:   Add #ifdef.

Problem:    Can't handle two messages right after each other.
Solution:   Find the end of the JSON.  Read more when incomplete.  Add a C
            test for the JSON decoding.