[illumina_qc] Manage disk usage

Disk usage is a sensitive point, especially with illumina data which taken a lot of space on disk.
Should find a way to try to use less memory in the future

changed milestone to %Next from 1.4.0

added Improvement New Feature labels

assigned to @jsabban

mentioned in commit db413556

closed

reopened

New special case : do not remove the work folder when using dev profile.

mentioned in commit 50ca307e

closed