add hashUpdate! to InnerIndexedTwoDimensionalArray
fix )abbrev from domain to package
Fix bug in '*' and 'gcd' in Factored
Whitespace cleanup
Fix input form of formal derivatives
fix fix usage of insert! and remove!
Add support for '^' in 'sign'
Fix 'child?' in RecursiveAggregate
fix usage of insert! and remove!
docfix typos: Thanks Frédéric Chapoton