Common/include/FileUtils.hpp
* Minor changes, changed some functions signature.

Common/include/FunctionUtils.hpp
* Declared function to get basename of a file.

Common/src/FileUtils.cpp
* Re-ordered definition of some functions to render code more readable.
* Re-factored function to load descriptors row from binary formatted file, using file streams and letting OpenCV allocate the memory.

Common/src/FunctionUtils.cpp
* Implemented newly added function.

Common/tests/IODescriptors_test.cpp
* Propagated changes in FileUtils namespace.