4.1 - Workflow optimizations and bug fixes

- Improved the performance and memory usage of the workflow generation process.
    -  Improved the performance and memory usage of jobs generation process.
    -  Improved the performance and memory usage of the dependency generation process.
- Improved the performance and memory usage of the workflow visualization process.
- Added a new filter to setstatus ( -ftcs ) to filter by split.
- Added -no-requeue to avoid requeueing jobs.
- Added a mechanism to detect duplicated jobs.
- Fixed multiples issues with the splits usage.
- Fixed multiples issues with Totaljobs.
- Reworked the deadlock detection mechanism.
- Changed multiple debug messages to be more clear.
- Changed the load/save pkl procedure
- Fixed issues with check command
- Added previous keyword.