Adds fitEllipseAMS to imgproc: The Approximate Mean Square (AMS) proposed by Taubin 1991.

Adds fitEllipseDirect to imgproc: The Direct least square (Direct) method by Fitzgibbon1999.

New Tests are included for the methods.
fitEllipseAMS Tests
fitEllipseDirect Tests

Comparative examples are added to fitEllipse.cpp in Samples.

modules/core/include/opencv2/core/utils/logger.hpp

@@ -16,6 +16,7 @@
 //
 //! @{
 
+namespace cv {
 namespace utils {
 namespace logging {
 
@@ -77,7 +78,7 @@ enum LogLevel {
 #endif
 
 
-}} // namespace
+}}} // namespace
 
 //! @}