Add new block transformations and fix small issues

examples/lj_func.py

runtime/devices/cuda.hpp

runtime/read_from_file.hpp

src/pairs/analysis/__init__.py

src/pairs/analysis/bin_ops.py

src/pairs/analysis/blocks.py

src/pairs/analysis/devices.py

src/pairs/ir/bin_op.py

src/pairs/ir/module.py

src/pairs/sim/pbc.py

src/pairs/transformations/__init__.py

src/pairs/transformations/blocks.py