%**%                    Multiply/join row records into block records.
%//%                    Factor-out (aggregate/project) block records
                        into row records.
blocks_to_rowrecs       Map data records from block records to row
                        records.
blocks_to_rowrecs_spec
                        Create a block records to row records transform
                        specification.
build_pivot_control     Build a blocks_to_rowrecs()/rowrecs_to_blocks()
                        control table that specifies a pivot from a
                        'data.frame'.
build_unpivot_control   Build a rowrecs_to_blocks() control table that
                        specifies a un-pivot (or "shred").
cdata-package           'cdata': Fluid Data Transformations.
convert_cdata_spec_to_yaml
                        Convert a layout_specification,
                        blocks_to_rowrecs_spec, or
                        rowrecs_to_blocks_spec to a simple object.
convert_records         General transform from arbitrary record shape
                        to arbitrary record shape.
convert_yaml_to_cdata_spec
                        Read a cdata record transform from a simple
                        object (such as is imported from YAML).
layout_by               Use transform spec to layout data.
layout_by.blocks_to_rowrecs_spec
                        Use transform spec to layout data.
layout_by.cdata_general_transform_spec
                        Use transform spec to layout data.
layout_by.rowrecs_to_blocks_spec
                        Use transform spec to layout data.
layout_specification    Create a record to record spec.
map_fields              Map field values from one column into new
                        derived columns (takes a 'data.frame').
map_fields_q            Map field values from one column into new
                        derived columns (query based, takes name of
                        table).
pivot_to_rowrecs        Map data records from block records that have
                        one row per measurement value to row records.
rowrecs_to_blocks       Map a data records from row records to block
                        records.
rowrecs_to_blocks_spec
                        Create a row records to block records transform
                        specification.
unpivot_to_blocks       Map a data records from row records to block
                        records with one record row per
                        columnsToTakeFrom value.
