Improving gaze analysis pipeline chapters name. Replacing pictures. Improving hints and examples.

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+Add AOI analysis
+================
+
+The [ArLayer](../../argaze.md/#argaze.ArFeatures.ArLayer) class defines a space where to make matching of gaze movements with AOIs and inside which those matchings need to be analyzed.
+
+![Layer](../../img/ar_layer.png)
+
+## Add ArLayer to ArFrame JSON configuration file
+
+An [ArFrame](../../argaze.md/#argaze.ArFeatures.ArFrame) instance can contains multiples [ArLayers](../../argaze.md/#argaze.ArFeatures.ArLayer).
+
+Here is an extract from the JSON [ArFrame](../../argaze.md/#argaze.ArFeatures.ArFrame) configuration file with a sample where one layer is added:
+
+```json
+{
+	"name": "My FullHD screen",
+	"size": [1920, 1080],
+	...
+	"layers": {
+		"MyLayer": {
+			"aoi_scene" : {
+        		"upper_left_area": [[0, 0], [960, 0], [960, 540], [0, 540]],
+        		"upper_right_area": [[960, 0], [1920, 0], [1920, 540], [960, 540]],
+        		"lower_left_area": [[0, 540], [960, 540], [960, 1080], [0, 1080]],
+        		"lower_right_area": [[960, 540], [1920, 540], [1920, 1080], [960, 1080]]
+        	},
+        	"aoi_matcher": {
+                "DeviationCircleCoverage": {
+                    "coverage_threshold": 0.5
+                }
+            },
+        	"aoi_scan_path": {
+        		"duration_max": 30000
+        	},
+			"aoi_scan_path_analyzers": {
+				"Basic": {},
+				"TransitionMatrix": {},
+				"NGram": {
+					"n_min": 3,
+					"n_max": 5
+				}
+			}
+		}
+	}
+}
+```
+
+!!! note
+
+	Timestamped gaze movements identified by parent [ArFrame](../../argaze.md/#argaze.ArFeatures.ArFrame) are passed one by one to each [ArLayer](../../argaze.md/#argaze.ArFeatures.ArLayer). So, the execution of all [ArLayers](../../argaze.md/#argaze.ArFeatures.ArLayer) is done during parent [ArFrame.look](../../argaze.md/#argaze.ArFeatures.ArFrame.look) method call as explained in [previous chapter](configuration_and_execution.md).
+
+Now, let's understand the meaning of each JSON entry.
+
+### "MyLayer"
+
+The name of the [ArLayer](../../argaze.md/#argaze.ArFeatures.ArLayer). Basically useful for visualisation purpose.
+
+### AOI Scene
+
+The [AOIScene](../../argaze.md/#argaze.AreaOfInterest.AOIFeatures.AOIScene) defines a set of 2D [AreaOfInterest](../../argaze.md/#argaze.AreaOfInterest.AOIFeatures.AreaOfInterest) registered by name.
+
+![AOI Scene](../../img/ar_layer_aoi_scene.png)
+
+### AOI Matcher
+
+The first [ArLayer](../../argaze.md/#argaze.ArFeatures.ArLayer) pipeline step aims to make match identified gaze movement with an AOI of the scene.
+
+![AOI Matcher](../../img/ar_layer_aoi_matcher.png)
+
+The matching algorithm can be selected by instantiating a particular AOIMatcher [from GazeAnalysis submodule](pipeline_modules/aoi_matchers.md) or [from another python package](advanced_topics/module_loading.md).
+
+In the example file, the choosen matching algorithm is the [Deviation Circle Coverage](../../argaze.md/#argaze.GazeAnalysis.DeviationCircleCoverage) which has one specific *coverage_threshold* attribute.
+
+!!! warning "Mandatory"
+	JSON *aoi_matcher* entry is mandatory. Otherwise, the AOIScanPath and AOIScanPathAnalyzers steps are disabled.
+
+### AOI Scan Path
+
+The second [ArLayer](../../argaze.md/#argaze.ArFeatures.ArLayer) pipeline step aims to build a [AOIScanPath](../../argaze.md/#argaze.GazeFeatures.AOIScanPath) defined as a list of [AOIScanSteps](../../argaze.md/#argaze.GazeFeatures.AOIScanStep) made by a set of successive fixations/saccades onto a same AOI.
+
+![AOI Scan Path](../../img/ar_layer_aoi_scan_path.png)
+
+Once identified gaze movements are matched to AOI, they are automatically appended to the AOIScanPath if required.
+
+The [AOIScanPath.duration_max](../../argaze.md/#argaze.GazeFeatures.AOIScanPath.duration_max) attribute is the duration from which older AOI scan steps are removed each time new AOI scan steps are added.
+
+!!! note "Optional"
+	JSON *aoi_scan_path* entry is not mandatory. If aoi_scan_path_analyzers entry is not empty, the AOIScanPath step is automatically enabled.
+
+### AOI Scan Path Analyzers
+
+Finally, the last [ArLayer](../../argaze.md/#argaze.ArFeatures.ArLayer) pipeline step consists in passing the previously built [AOIScanPath](../../argaze.md/#argaze.GazeFeatures.AOIScanPath) to each loaded [AOIScanPathAnalyzer](../../argaze.md/#argaze.GazeFeatures.AOIScanPathAnalyzer).
+
+Each analysis algorithm can be selected by instantiating a particular AOIScanPathAnalyzer [from GazeAnalysis submodule](pipeline_modules/aoi_scan_path_analyzers.md) or [from another python package](advanced_topics/module_loading.md).
+
+In the example file, the choosen analysis algorithms are the [Basic](../../argaze.md/#argaze.GazeAnalysis.Basic) module, the [TransitionMatrix](../../argaze.md/#argaze.GazeAnalysis.TransitionMatrix) module and the [NGram](../../argaze.md/#argaze.GazeAnalysis.NGram) module which has two specific *n_min* and *n_max* attributes.