Facade changes and examples for StagingDirectives.
Iterated on feedback from AndreM.

- Removed "moment"
- Input and output explicit now by split into input_ and output_.
- Added flags
Some comments and notes.
Merge branch 'devel' into feature/staging
Rename states.
Allow "serialisation".
Minor changes to example.
Expose items from staging directives.
Serialize staging directives both for individual elements as well as lists.
Minor changes to agent. Only structural, no semantics yet.
Disable check, need to revisit logic of two queues.
Some renaming and disabled overall functionality for now.
Snapshot of migrating to staging directives.
Sample input files required for examples.
Add IDE.
merge from master
Merge branch 'feature/staging' of github.com:radical-cybertools/radical.pilot into feature/staging
make example a teeny bit easier to adapt
over to MS :)
Fix typo and disable cleanup.