cubicweb #687204 cubicweb-ctl exlog: use a proper file and not stdin for input [resolved]

using stdin is inconvenient on windows, and there is no way to have cw produce the log file on stdout anyway.

exlog should take a filename as an argument. If we really need to accept stdin, the standard convention of using "-" as input filename should be used.

done in3.7.5
load left0.000
closed by<not specified>