More results options in log

[vrastil]

• more results status in log: -- all -- none -- part, status = {}

• json format?

[vrastil]

json libraries: https://github.com/nlohmann/json https://www.codeproject.com/Articles/20027/JSON-Spirit-A-C-JSON-Parser-Generator-Implemented

[vrastil]

added json output format with "results" = null

[vrastil]

arbitrary combinations of rerun and skip steps can be input into analyze_run