From Alberto Luacas, typo fixes

src/osgPlugins/ogr/ReaderWriterOGR.cpp

@@ -102,7 +102,7 @@ public:
     {
         supportsExtension("ogr","OGR file reader");
         supportsOption("useRandomColorByFeature", "Assign a random color to each feature.");
-        supportsOption("addGroupPerFeature", "Places each feature in a seperate group.");
+        supportsOption("addGroupPerFeature", "Places each feature in a separate group.");
         oldHandler = CPLSetErrorHandler(CPLOSGErrorHandler);
     }
 

src/osgPlugins/quicktime/ReaderWriterQT.cpp

@@ -326,7 +326,7 @@ public:
          
          // note from Robert Osfield when integrating, we should probably have so
          // error handling mechanism here.  Possibly move the load from
-         // the constructor to a seperate load method, and have a valid
+         // the constructor to a separate load method, and have a valid
          // state on the ImageStream... will integrated as is right now
          // to get things off the ground.
          QuicktimeImageStream* moov = new QuicktimeImageStream(fileName);

src/osgPlugins/stl/ReaderWriterSTL.cpp

@@ -88,7 +88,7 @@ private:
     {
       if (options && (options->getOptionString() == "separateFiles"))
       {
-        OSG_INFO << "ReaderWriterSTL::writeNode: Files are seperated written" << std::endl;
+        OSG_INFO << "ReaderWriterSTL::writeNode: Files are separated written" << std::endl;
       } else {
         m_f = new osgDB::ofstream(m_fout.c_str());        
         *m_f << "solid " << counter << std::endl;

src/osgPlugins/txp/trpage_header.cpp

@@ -332,7 +332,7 @@ bool trpgHeader::Read(trpgReadBuffer &buf)
     return isValid();
 }
 
-// Read the LOD info (seperate token)
+// Read the LOD info (separate token)
 bool trpgHeader::ReadLodInfo(trpgReadBuffer &buf)
 {
     float64 range;