Added a new script for view cell based on visual place cells script by Aminata Barry https://git.cyu.fr/promethe2/multimodal_pc

Added a new altitude measure in drone script but we can't use the new and the old one at the same time for now.
In order to revert back to the old altitude, just change to link between 'alt_2_offset' and 'throttle_err' to 'alt' and 'throttle_err' in the script drone.symb.
Note: since altitude_2 is relative to mean sea level and is from the barometer (drift and big variance), some tweaks are done to make it relative to our current starting point (checkbox start_alt) and filtered (mean value).

Add a new project that combine different promethe scripts (using themis): it reuses cam_f_out, drone_joyRemote and drone_flot (with some differences)

Little code correction (typo, print ...)

Changed fly_monitor indent from tab to space

Change droneRemote script name to drone_joyRemote (little bit more explicit), added global variable for more flexibility
Updated the readmes in consequence

Added possibility to study different altitude, yaw and motors curves for droneRemote by plotting them
Updated fly_monitor to limit high values (limited to 0.5 instead of 1) to send for drone control

Update Readme, update fly_monitor to include message frequency init for (distance sensor and compass heading)

Adapted fly_monitor to the new droneRemote script

- reset VTIME and VMIN to 0 for serial port access so that the access is non-blocking
- modified threads frequency computation in order to make it more accurate
- corrected some typos

dromeRemote script update:
- change throttle control to altitude incremental control
- added compass heading for yaw control
- adjusted box placement in the interface to make the script prettier

update promethe scripts to make it cleaner, update README, changed some variables names in fly_monitor

added position control mode, type 'manual' to test (a promethe script must interact with pixhawk.control.motors at least)