Answers to 4.59 tested with query language and updated as follows:

a.) changed x? and y? to ?x and ?y
b.) updated rule to use division of ?person (added rule to ch4-query.scm file)
c.) corrected spelling of "Wednesday"

updated ch4-query.scm with rule from part b.) above

updated README and included instruction to initialize data base
(initialize-data-base microshaft-data-base)