Add PS4 variable to host

[corentincarton]

Is your feature request related to a problem? Please describe.

A very useful thing would be to add a PS4 variable to improve logging and display the time together with the line of the script. For instance:

export PS4="[ \D{%Y-%m-%dT%H:%M:%S} | L$LINENO ] --> "
 
set -TEexuva -o pipefail +v

Thanks @vandome for the suggestion!

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