Add PROCESSORS_PER_NODE in platforms configuration. If TASKS not defined in jobs.conf PROCESSORS_PER_NODE of the platform is taken.

Merge branches 'develop' and 'develop-refactor-saga-n-paramiko' of https://earth.bsc.es/gitlab/es/autosubmit into develop

In Autosubmit 3.5.0 if TASKS (jobs.conf) not defined, defaults to 1. Now added a constant to fix it to 24 in the default case. Partially fixes #141

Conflicts:
	autosubmit/platforms/platform.py
	autosubmit/platforms/submitter.py
	setup.py

Conflicts:
	autosubmit/platforms/platform.py
	autosubmit/platforms/submitter.py
	setup.py

Moved minimal requirement of SAGA library to 0.40 or above. 0.39 doesn't work anymore for mn_adaptor.

SAGA session need to be constructed with False, otherwise contexts are added up to default context. When using multiple platforms Autosubmit didn't manage to get the correct password for current platform (see https://github.com/radical-cybertools/saga-python/issues/555). Fixes #140

Processes per node (NUMTASK) should default to 0 or empty, not 1. Otherwise span[ptile=1] was introduced in Mn3 job header and when NUMPROC above 180 cores job was banned. Fixes #141