fixed bugs reported by Massaroddel. Tracker request peer-count could be incorrect. Empty files were not created in full allocation mode.

src/file.cpp

@@ -212,6 +212,11 @@ namespace libtorrent
 			assert(m_open_mode & mode_out);
 			assert(m_fd != -1);
 
+			// Test this a bit more, what happens with random failures in
+			// the files?
+//			if ((rand() % 100) > 80)
+//				throw file_error("debug");
+
 			size_type ret = ::write(m_fd, buf, num_bytes);
 			if (ret == -1)
 			{