JSON API server uses standardized error handling based on
std::error_condition for a few method, this improve debugabbility both
from library size and from API client side
JSON API auth token are now more flexible, now the only proibition is using
colon character ':' in user name
Implemented TO_JSON operation for std::error_condition
Avoid unkown serial job handling code duplication via fatalUnknownSerialJob
Usability improvement in t_RsLogger
Disable compilation of now unused is_alphanumeric