Testing bugs

[sthomas08]

In the testing directory, for the program

testing_dgesv_gpu.cpp

and likely others due to cut and paste, the code does not initialize 'N'
and so it is not possible to specify different matrix sizes. The fix is:

magma_int_t lda, ldb, N=0;

[Stan Tomov]

Thanks for pointing this out. We had other user requests and feedback on the testers and we redesigned them. They are more uniform looking now and support -h option to print help. Different options give the user a way to specify specific sizes, ranges, error checking, etc. This will be available with the next release.