added "-ggdb3" to GCC flags in Debug configuratin. Hopefully, it will solve problems with tracing code with debuggers

fixed bug with Mat::dataend initialization. Now morph-ex test passes; Also fixed CV_Assert() implementation

the blacklist is sorted in alphabetical order; several tests that should now pass have been commented off

fixed ds-graphscan test to make sure that the memory block size is large enough to fit at least the graph header and the sequence block header (ticket 504)

fixed test failure in matrix-dotproduct test (by increasing the desired accuracy threshold) (ticket #447)

refactored gpu module.