Rename log to Log to avoid collision with standard math function

Rename log to Log to avoid collision with standard math function

    	* LogSingleton.h: Rename log macro to Log to avoid collision with
    	standard math function in some versions of g++.
    	* AntiVirus.cc: Replace invocations of log with Log.
    	* IniDBBuilderPackage.cc: Ditto.
    	* LogFile.cc: Ditto.
    	* PickView.cc: Ditto.
    	* archive.cc: Ditto.
    	* archive_tar.cc: Ditto.
    	* choose.cc: Ditto.
    	* cygpackage.cc: Ditto.
    	* download.cc: Ditto.
    	* geturl.cc: Ditto.
    	* ini.cc: Ditto.
    	* install.cc: Ditto.
    	* io_stream.cc: Ditto.
    	* io_stream_cygfile.cc: Ditto.
    	* localdir.cc: Ditto.
    	* main.cc: Ditto.
    	* mount.cc: Ditto.
    	* msg.cc: Ditto.
    	* net.cc: Ditto.
    	* nio-ftp.cc: Ditto.
    	* package_db.cc: Ditto.
    	* package_meta.cc: Ditto.
    	* package_version.cc: Ditto.
    	* prereq.cc: Ditto.
    	* processlist.cc: Ditto.
    	* proppage.cc: Ditto.
    	* root.cc: Ditto.
    	* script.cc: Ditto.
    	* site.cc: Ditto.
    	* source.cc: Ditto.
    	* threebar.cc: Ditto.
    	* win32.cc: Ditto.
    	* window.cc: Ditto.