Clarified assert message for allowed PnP flags

This should allow many algorithms to take advantage of more parallelization
technologies.

Made all STL usages explicit to be able automatically find all usages of
particular class or function.

added test for solvePnP
changed test for solvePnPRansac
fixed bug with mutex solvePnPRansac

added COVAR_ and SORT_ enums to core.hpp; fixed many, many VS2005, VS2010 and MinGW (GCC 4.5.2) warnings

replaced "const InputArray&" => "InputArray"; made InputArray and OutputArray references. added "None()" constant (no array()).

test was refactored

a big patch; use special proxy types (Input/OutputArray, Input/OutputArrayOfArrays) for passing in vectors, matrices etc.