Cleanup unknown formatting in pipipi0DPFit example

`%\n` in format string causes compiler warnings:

    MixFit.cc: In function ‘void runCanonicalFit(char*, bool)’:
    MixFit.cc:3385:49: warning: unknown conversion type character 0xa in format [-Wformat=]
       100*ptr_to_ymix->value, 100*ptr_to_ymix->error);
                                                     ^
    MixFit.cc:3385:49: warning: unknown conversion type character 0xa in format [-Wformat=]

This is invalid format. The patch removes it.

Signed-off-by: David Abdurachmanov <davidlt@cern.ch>
Only use cudaSetDevice(..) if Thrust backend is CUDA

`cudaSetDevice` must not be called in OpenMP mode. The patch enables
it only if CUDA Thrust backend is used.

Signed-off-by: David Abdurachmanov <davidlt@cern.ch>
Make pipipi0DPFit example compiling on Nvidia Jetson TK1 (CUDA)

Nvidia Jetson TK1 is Tegra K1 (32-bit) SoC based development board
with fully CUDA capable GPU inside. CUDA 6.0 is currently supported
on Jetson TK1.

This is 32-bit system, thus we need to adjust CUDA library directory.

Signed-off-by: David Abdurachmanov <davidlt@cern.ch>
Remove CUDALIBDIR from the main GooFit Makefile

`CUDALIBDIR` is not used in the main GooFit Makefile. The patch removes
all the references.

Signed-off-by: David Abdurachmanov <davidlt@cern.ch>