update vpc_compass script : add save command from frone script, if you save from the drone script, the vpc_compass will this info and will save the place cells activities in vpc_compass/plot/PC.SAVE

new script "navigation_vpc_compass" : add a new script for view cell/compass association (LMS) + a compass control in output

update drone script : change gas variable parameters to mask for faster test without to recompile when changing the parameters

Changed gas parameters from variable (in drone.var) to mask (external file like mask_gas.txt). That way, it is faster to change without compiling. Update readme.

fly_monitor update: separate manual control script (control with altitude) and manual direct script (control directly the gas)

- send 0 for non detection or bad detection (under the threshold) (when in the middle =0.5 in the x axis)
- send negative to go left (when <0.5 in the x axis)
- send positive to go right (when >0.5 in the x axis)

update fly_monitor to add a test version for manual command (removed the arming part), it will the control command to the drone but the drone will not answer.

Moved unit test script to a "example" folder to avoid confusion with "navigation" folder which is the actual implementation
Update readmes

Added a new script tracking for object tracking, it allows to learn object visually (associated with focus points) and send control commands to track the object on the horizontal axis (left/right)
Removed navigation .net
Added instead 2 new .net file for each different visual control, one for the optical flow (flot) and one for object tracking (tracking)

Update view_cell script to have faster processing, it does no longer recalculate values for difference of gaussians for each image but stock those values during initalization (the beginning takes ~1 min)
Update cam_usb.hwc to the right size of the image captured by the FOXEER camera
some small update on .gcd, .sh script ...

Updated drone script to send joystick inputs to the shared memory, and added a checkbox for visual control (on vmotors)
Added a new commands script to save experiments

Changed f_out "v_motors"'s channel name to "simulation" because it was confusing with (pixhawk.control)

+ small update on fly_monitor

Added a new script : object tracking. Part of it reuses view_cells, it allows learning of view cells and associates to an object.