[Positioning] Building & CSVFileReader: minor edits

Building: fix a comment.
CSVFileReader: delete useless "boost::" prefix (we have using namespace
boost).

owlps-positioning/src/building.cc

@@ -39,7 +39,7 @@ Building::~Building()
 
 
 /**
- * @param area A pointer to the Area to add. If \em a is NULL, nothing
+ * @param area A pointer to the Area to add. If it is NULL, nothing
  * will be added. If the Area it points to already exist in #areas, it is
  * deleted and nullified, unless it is the same pointer (see the code to
  * understand!); hmm, maybe we should handle that with exceptions…

owlps-positioning/src/csvfilereader.cc

@@ -101,9 +101,9 @@ bool CSVFileReader::read_point3d(Point3D &p)
 
       try
         {
-          coord[i] = boost::lexical_cast<float>(*token_iterator) ;
+          coord[i] = lexical_cast<float>(*token_iterator) ;
         }
-      catch (boost::bad_lexical_cast &e)
+      catch (bad_lexical_cast &e)
         {
           print_error_cast() ;
           return false ;