[debug] syntax highlight SQL and RQL debug output This prevent DBG_RQL and DBG_SQL output to looks like a gigantic blob of white text. Do this only if we detect that we are in a tty and that pygments is installed. Closes #17222885

etc/init.d
etc/cubicweb.d
usr/bin
var/log/cubicweb
var/lib/cubicweb/backup
var/lib/cubicweb/instances