Update serial examples

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
remove similar duration example

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
Merge branch 'devel' of github.com:ULHPC/launcher-scripts into devel

* 'devel' of github.com:ULHPC/launcher-scripts:
  launcher_checkpoint_restart.sh: supports besteffort, resubmission and checkpointing via blcr (tested on Chaos)
  dummy job mytask.sh
  Reorganization in launcher_besteffort.sh
  Rename launcher_best_effort.sh -> launcher_besteffort.sh
  Basic example for besteffort and idempotent jobs
  Fix a typo in mytask.sh

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>

Conflicts:
	bash/serial/mytask.sh