Some documentation improvements

Doxyfile

@@ -1244,7 +1244,7 @@ INCLUDE_FILE_PATTERNS  =
 # undefined via #undef or recursively expanded use the := operator 
 # instead of the = operator.
 
-PREDEFINED             = OSMIUM_WITH_GEOS OSMIUM_WITH_SHPLIB OSMIUM_WITH_PBF_INPUT OSMIUM_WITH_PBF_OUTPUT OSMIUM_WITH_XML_INPUT OSMIUM_WITH_XML_OUTPUT
+PREDEFINED             = __linux__ OSMIUM_WITH_GEOS OSMIUM_WITH_SHPLIB OSMIUM_WITH_PBF_INPUT OSMIUM_WITH_PBF_OUTPUT OSMIUM_WITH_XML_INPUT OSMIUM_WITH_XML_OUTPUT
 
 
 # If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then 

Makefile

@@ -43,7 +43,7 @@ check-includes:
 indent:
 	astyle --style=java --indent-namespaces --indent-switches --pad-header --suffix=none --recursive include/\*.hpp examples/\*.cpp examples/\*.hpp osmjs/\*.cpp test/\*.cpp
 
-doc: doc/html/files.html
+doc: doc/html/files.html Doxyfile
 
 doc/html/files.html: include/*.hpp include/*/*.hpp include/*/*/*.hpp
 	doxygen >/dev/null

include/osmium/geometry/haversine.hpp

@@ -30,7 +30,7 @@ namespace Osmium {
     namespace Geometry {
 
         /**
-         * Functions to calculate arc distance on Earth using the haversine formula.
+         * @brief Functions to calculate arc distance on Earth using the haversine formula.
          *
          * See http://en.wikipedia.org/wiki/Haversine_formula
          *

include/osmium/javascript/wrapper/osm.hpp

@@ -36,6 +36,9 @@ namespace Osmium {
 
     namespace Javascript {
 
+        /**
+         * @brief Functions wrapping %Osmium objects for use from %Javascript
+         */
         namespace Wrapper {
 
             struct OSMTagList : public Osmium::Javascript::Template {

include/osmium/utils/timestamp.hpp

@@ -27,6 +27,9 @@ You should have received a copy of the Licenses along with Osmium. If not, see
 
 namespace Osmium {
 
+    /**
+     * @brief Miscellaneous utility functions
+     */
     namespace Utils {
 
         /**