utility that reads a table in a csv (comma separated) format that can be
generated from Open Office Calc (spreadsheet), derives all shortest rules for
a selected attribute, and writes them to a .csv file that can be read by OO
Calc. The shortest rules may be partially ordered by implication (entailment)
and equivalence (equality) and the top level is also shown in .csv format.
Optionally all logical entailments and equalities are listed as well. If the
data set contains ambiguous rules or more occurrences of the same rule the
user is warned