Mini-changelog:
e55e315 Updated Sage version to 6.7.beta3
93a7ac6 Trac #18076: Coercion for numpy types
636a926 Trac #17682: Generic filename extension for shared libraries
b549ae1 Trac #17662: Evenly distributed sets
89b92eb Trac #18276: is_squarefree() should not restrict to PID's
ad79332 Trac #18254: osx R spkg error: expected ',' or '}' before '__attribute__'
f61f16b Trac #18045: Wrong result returned by is_planar on a given embedding
0f523ea Trac #17823: Three.js optional package
8c4f345 Trac #17971: Infinite recursion when taking a resultant over a complicated base ring
0bc2257 Trac #18271: Stanley hook content formula
689d2ae Trac #18194: Speedup of calculation of Macdonald H and Ht bases
4f14802 Trac #18189: real_roots.root_bounds: Inconsistent return types
47c830d Trac #18169: Ref: add various missing modules to r/*rings*
066de7a Trac #9903: is_prime should document proof flag
98c1e7c Trac #18297: Increase tolerance in a doctest in linear programming tutorial
5ae753a Trac #18283: Words random element is wrong
5b5a4c0 Trac #18240: fix MPIR's compliance with c++
43bda95 Trac #17575: Implement incidence algebra of a (finite) poset
8185778 Trac #17243: connect bubble sort graph and permutahedron
7444285 Trac #18287: Fix percentage in sage-coverageall
2458dbe Trac #17760: Doc fixes in combinat/species/generating_series.py
7cd3b13 Trac #18285: Implement reduced word graph
0e2f583 Trac #18294: Cython memleak
9635a9f Trac #2072: Remove _neg_c_impl and _invert_c_impl from some classes.
580b578 Trac #18275: subtraction fails for cartesian products of rings
9c013fb Trac #18273: SymmetricGroup(...).algebra(..., category=...) for consistency
90333a9 Trac #18121: Patch Cython with PyTypeObject members
051af70 Trac #18099: Prepare linear_code for inheritance
40c033b Trac #17932: Ref: add various missing modules to r/misc
ef90aea Trac #11529: Rooted trees
0865e6b Trac #18252: add_path doc error
7dff64e Trac #18217: Various Cython code fixes
9b1e098 Updated Sage version to 6.7.beta2