This reverts commit 907a9101.

It is needed because of explicit STL include paths.
Otherwise some standard headers (like fenv.h) can not not be correctly found by the compiler.

Conflicts:
	modules/video/src/simpleflow.cpp
	modules/video/test/test_simpleflow.cpp

+ Improve performance of calcOpticalFlowSingleScale method
+ Small refactoring

Current results:

IMAGE NAMES          RMSE
Beanbags
Dimetrodon           0.329428
DogDance
Grove2               0.550852
Grove3               1.464699
Hydrangea            0.523277
MiniCooper
RubberWhale          0.367246
Urban2               2.717003
Urban3               4.185070
Venus                0.775422
Walking

Time (for Urban3):
17.490248 sec

The version reported by toolchain is 4.6.x-google so regex needs an adjustment.

Overloaded PCA constructor and ( ) operator to implement Feature#2287 - PCA that retains a specified amount of variance from the data. A sample was added to samples/cpp to demonstrate the new functionality. Docs and Tests were also updated

Local reference table overflow in JNI code fixed.

added openfabmap code, contributed by Arren Glover. fixed several warnings in the new versions of retina filters