Make the log level for command lines configurable
  In certain use cases, it is desirable to be able to change the log level
  at which cpptasks-parallel logs the command lines called for external
  commands, e.g. when the command lines are meant to be parsed by, say,
  Eclipse's CDT to make nicer logs. (tag=commandLogLevel:int)
Removed questionable filtering of MSG_INFO logging. (Breaks commandLogLevel)

  Only some/arbitrary INFO logs pass the filter.
  Also the filter breaks commandLogLevel feature.
  (Code left commented for implementor to analyze purpose)