Create an error_message property on the AutosubmitError.

Closes #972

See merge request !326

Replace As by Autosubmit

See merge request !331

small fixes

See merge request !332

Add cat-log command to view logs from the command-line

Closes #930

See merge request !320

Add an `-i` `--`inspect` option to use log files produced by `autosubmit inspect` (i.e. from /tmp) folder

This property checks if ``.trace`` is ``None`` before using
it to create a string to be logged or passed to another function.

Move all tests to test/unit folder

See merge request !328

Prevent duplicate logs folder being created in autosubmit expid

Closes #985

See merge request !329

# Conflicts:
#	autosubmit/platforms/paramiko_platform.py
#	autosubmit/platforms/slurmplatform.py

Job_start_info + run_experiment modular

See merge request !325