remove 'layercount' attribute from project file

The 'layercount' attribute was not used anyway and the calculated number could already be outdated when loading the project file again due to changes to embedded projects.

Author: SebDieBln

python/plugins/processing/tests/data/project.qgs

@@ -45,7 +45,7 @@
             </filegroup>
         </legendlayer>
     </legend>
-    <projectlayers layercount="4">
+    <projectlayers>
         <maplayer minimumScale="0" maximumScale="1e+08" geometry="Line" type="vector" hasScaleBasedVisibilityFlag="0">
             <id>lines20130323011923044</id>
             <datasource>./lines.shp</datasource>

src/core/qgsproject.cpp

@@ -1058,7 +1058,6 @@ bool QgsProject::write()
   // Iterate over layers in zOrder
   // Call writeXML() on each
   QDomElement projectLayersNode = doc->createElement( "projectlayers" );
-  projectLayersNode.setAttribute( "layercount", qulonglong( layers.size() ) );
 
   QMap<QString, QgsMapLayer*>::ConstIterator li = layers.constBegin();
   while ( li != layers.end() )

tests/testdata/labeling/test-labeling.qgs

@@ -42,7 +42,7 @@
             </filegroup>
         </legendlayer>
     </legend>
-    <projectlayers layercount="3">
+    <projectlayers>
         <maplayer minimumScale="0" maximumScale="1e+08" simplifyDrawingHints="1" minLabelScale="0" maxLabelScale="1e+08" simplifyDrawingTol="1" geometry="Polygon" simplifyMaxScale="1" type="vector" hasScaleBasedVisibilityFlag="0" simplifyLocal="1" scaleBasedLabelVisibilityFlag="0">
             <id>aoi20130902095858570</id>
             <datasource>dbname='./pal_features_v3.sqlite' table="aoi" (geometry) sql=</datasource>

tests/testdata/qgis_local_server/test-project/test-server.qgs

@@ -37,7 +37,7 @@
             </filegroup>
         </legendlayer>
     </legend>
-    <projectlayers layercount="2">
+    <projectlayers>
         <maplayer minimumScale="0" maximumScale="1e+08" simplifyDrawingHints="1" minLabelScale="0" maxLabelScale="1e+08" simplifyDrawingTol="1" geometry="Polygon" simplifyMaxScale="1" type="vector" hasScaleBasedVisibilityFlag="0" simplifyLocal="1" scaleBasedLabelVisibilityFlag="0">
             <id>aoi20130902095858570</id>
             <datasource>dbname='./features_v3.sqlite' table="aoi" (geometry) sql=</datasource>

tests/testdata/qgis_server/test+project.qgs

@@ -47,7 +47,7 @@
       </filegroup>
     </legendlayer>
   </legend>
-  <projectlayers layercount="1">
+  <projectlayers>
     <maplayer minimumScale="-4.65661e-10" maximumScale="1e+08" simplifyDrawingHints="0" minLabelScale="0" maxLabelScale="1e+08" simplifyDrawingTol="1" geometry="Point" simplifyMaxScale="1" type="vector" hasScaleBasedVisibilityFlag="0" simplifyLocal="1" scaleBasedLabelVisibilityFlag="0">
       <id>testlayer20150528120452665</id>
       <datasource>./testlayer.shp</datasource>

tests/testdata/qgis_server/test+project_wfs.qgs

@@ -72,7 +72,7 @@
       <layer_coordinate_transform destAuthId="EPSG:4326" srcAuthId="EPSG:4326" srcDatumTransform="-1" destDatumTransform="-1" layerid="testlayer20150528120452665"/>
     </layer_coordinate_transform_info>
   </mapcanvas>
-  <projectlayers layercount="1">
+  <projectlayers>
     <maplayer minimumScale="-4.65661e-10" maximumScale="1e+08" simplifyDrawingHints="0" minLabelScale="0" maxLabelScale="1e+08" simplifyDrawingTol="1" geometry="Point" simplifyMaxScale="1" type="vector" hasScaleBasedVisibilityFlag="0" simplifyLocal="1" scaleBasedLabelVisibilityFlag="0">
       <id>testlayer20150528120452665</id>
       <datasource>./testlayer.shp</datasource>

tests/testdata/qgis_server_accesscontrol/project.qgs

@@ -375,7 +375,7 @@
       </ComposerLabel>
     </Composition>
   </Composer>
-  <projectlayers layercount="5">
+  <projectlayers>
     <maplayer minimumScale="-4.65661e-10" maximumScale="1e+08" simplifyDrawingHints="1" minLabelScale="1" maxLabelScale="1e+08" simplifyDrawingTol="1" geometry="Polygon" simplifyMaxScale="1" type="vector" hasScaleBasedVisibilityFlag="0" simplifyLocal="1" scaleBasedLabelVisibilityFlag="0">
       <id>Hello_copy20150804164427541</id>
       <datasource>dbname='./helloworld.db' table="hello" (geom) sql=</datasource>