Window objects cannot be compared to each other

[ZyX-I]

In Vim I would expect the following print True:

python import vim; print vim.windows[int(vim.eval('winnr()')) - 1] is vim.current.window

. But in NeoVim I can neither use the above code nor compare window.number attribute. This attribute is present at least since vim-7.0.112. Tabpage objects are missing this attribute as well.

[bfredl]

fixed except for the number part (#87)