Added n-dimensional redistribution function for block->cyclic
Added n-dimensional redistribtion function cyclic->block
Enabled n-dimensional redistribution/local FFT in cuda code
Fixed two bugs

- when processor order is row_major
- when number of processors is unequal among dimensions
Fixed compile error when ENABLE_MPI_CUDA is ON
Small optimization (reuse device variables)
Use floats with fall-back host FFT
Added processor mapping option to dfft_create_plan
Fixed bug in proc mapping
updated docs
0.1 -> 0.2