- check and make sure the fd is closed before processing and/or deleting logs.
- change from fd 3 to 13, for extra "this is evil". is it? is 13 an evil number? you decide.
- default `SHOW_LOG=yes` if user on terminal
- shortcut: `DEBUG=yes` defaults both `SHOW_LOG=yes` & `SHOW_DEBUG=yes`
- much simpler logging format for log file
- skip all display_alert()'s more verbose than DEBUG from logfile
- set `DEBUG=yes` to log everything again
- skip Markdown assets from being included in ANSI log
- use of `ccze`
- introduce internal var for controlling COMMAND-level log
- remove unused `run_on_sdcard()` that somehow was left there
- drop `export_html_logs()` and `EXPORT_HTML_LOG` -- are no more
