Trac #13948: Document that Sage can now be bootstrapped with Clang
Trac #15193: add method Factorization._pari_(), using itertools.chain
Trac #15189: fixed recursion in _equivalence method used by is_field_isomorphic
Trac #13948: fix various configure tests which break with Clang
Trac #15252: Doctest tolerance
5.12.rc1
5.12.rc1
Merge 'sage-5.12.rc1' into master