Increase version number
Fix unittest suite
(transplanted from 6381c20cf23119a3b29720a01417780b11f85b65)

--HG--
extra : transplant_source : c%81%C2%0C%F21%19%A3%B2%97%20%A0%14%17x%0B%11%F8%5Be
Integer, Numeric and Float allow None as value
(transplanted from 625aecd55d0ff2ddfc673e2a6630c5d01a4a5556)

--HG--
extra : transplant_source : bZ%EC%D5%5D%0F%F2%DD%FCg%3E%2Af0%C5%D0%1AJUV
Increase version number
Fix unittest suite
(transplanted from 6381c20cf23119a3b29720a01417780b11f85b65)

--HG--
extra : transplant_source : c%81%C2%0C%F21%19%A3%B2%97%20%A0%14%17x%0B%11%F8%5Be
Increase version number
Prepare release 2.4.1
Added tag 2.4.1 for changeset 77b8a2bc919a
Increase version number
Prepare release 2.6.1
Added tag 2.6.1 for changeset 5901c9d5e13c
Increase version number
Increase version number
null merge from 2.4
null merge from 2.6
null merge from 2.8
null merge from 3.0
Improve setup.py to allow dev publication

issue3436
issue1891
review2441002