Turn on/off Logging

How does logging work in FsHttp:

• In F# interactive, console logging (via logfn) are enabled per default.
• It's then possible to deactivate logging globally, using Fsi.disableDebugLogs()
• In a non-F# interactive environment, there should be no logging at all per default.
• It's possible to turn on logging via Fsi.enableDebugLogs() (which is also applied to non-interactive environments).