pretty formatting of reports, added field repport

examples/bubble/periodic_bubble.py

hysop/core/graph/computational_graph.py

hysop/core/graph/graph_builder.py

hysop/core/graph/node_generator.py

hysop/core/memory/memory_request.py

hysop/fields/default_fields.py

hysop/fields/field_requirements.py

hysop/operator/adapt_timestep.py

hysop/operator/base/min_max.py

hysop/operator/base/redistribute_operator.py

hysop/operator/base/transpose_operator.py

hysop/operator/directional/directional.py

hysop/operator/redistribute.py

hysop/operator/transpose.py

hysop/tools/handle.py

hysop/tools/string_utils.py