Improved verification of current experiment run in the historical database.

See merge request !260

Added documentation for the custom shebang feature.

See merge request es/autosubmit!258

Tweaks autostartdate

See merge request !259

The previous implementation of structure did not consider jobs that did not...

See merge request !257

The previous implementation of structure did not consider jobs that did not have any dependency, resulting in an unnecessary execution of transitive reduction every time the experiment is monitored. It is now fixed.

Changed Copyright year, added more documentation.

See merge request !256

Fixed #672. We now consider running jobs for the count of total jobs allowed.

Closes #672

See merge request !253

# Conflicts:
#   autosubmit/job/job_packager.py

Auto startdate

See merge request !255