Adding prism and initial prism-ros interaction
Really adding prism
Merge branch 'hydro-devel' of https://github.com/strands-project/strands_executive into hydro-devel
using nav data to fill mdp probabilities and costs
Removing prism from git tracking
adding git submodule for prism
getting prism to compile
updating prism submodule
prism updates
allowing to change initial state for expected travel times
more prism changes
Merge branch 'hydro-devel' of https://github.com/strands-project/strands_executive into hydro-devel

Conflicts:
	scheduler/src/scheduler.cpp
	task_executor/scripts/example_task_routine.py

Conflicts solved by mostly using what was upstream
correcting small bug during last merge
getting example task routines to have proper start and ending points
reverting change in scheduler
saving prism files to temp dir
code cleaning
prism updated, big fixes, adding mdp_planner to launch file
adding service to update the mdp using the navigation statistics in the db
Merge branch 'hydro-devel' of https://github.com/strands-project/strands_executive into hydro-devel