Added functionality for higher dimensional resultants.
Trac 16833 Added comments and examples
Trac 16833 Fixed typos
Fixed problems with coercions from Pari to Sage
Fixed typos and added an extra error check for domain codomain compatibility
Changed TypeError to ValueError when passing in wrong fields
trac #16802: database of difference family
trac #16802: Review
trac #16802: review the review

- a simplified sentence in the doc
- better verbose message
- make it work for non-Abelian groups
trac #16863: twin prime difference set
trac #16863: Handle all prime powers (not just primes)
trac #16863: doc and simplification
trac #16869: fast prime_powers
trac #16869: fix prime_powers(0,1)
Trac #16802: difference family database

Import the database from the Handbook of combinatorial design inside
Sage.

URL: http://trac.sagemath.org/16802
Reported by: vdelecroix
Ticket author(s): Vincent Delecroix
Reviewer(s): Nathann Cohen
Trac #16863: twin prime difference sets

Some new difference set (not very visible... but still new BIBD in
perspective).

URL: http://trac.sagemath.org/16863
Reported by: vdelecroix
Ticket author(s): Vincent Delecroix
Reviewer(s): Nathann Cohen
Trac #16869: faster prime_powers

The function `prime_powers` in `sage.rings.arith` was using the symbolic
ring... it would be faster to use a `sleep(10)` and avoid it.

URL: http://trac.sagemath.org/16869
Reported by: vdelecroix
Ticket author(s): Vincent Delecroix
Reviewer(s): Nathann Cohen
Trac #16833: Use MacCauley Resultant to compute resultant of projective morphisms for dim >1

Currently resultants for dim greater than one not implemented, changing
to call MacCauley resultants for higher dimensions.

URL: http://trac.sagemath.org/16833
Reported by: jdefaria
Ticket author(s): Joao de Faria
Reviewer(s): Ben Hutz