Fix mit-scheme

These changes are necessary for me to use mit-scheme on i686 NixOS.
mit-scheme in the current state should be broken on x86_64 either and
these changes should fix, too. I however did not test this.
tinc:  A VPN daemon with full mesh routing.
pythonPackages: default to python's maintainers and platforms
chromiumBeta and Dev update

dev should be 26.0.1386.0, but its link is broken
Fixed tinc license.
tinc: GPLv2+, not GPLv2.
v4l: Fix building of ir-keytable
Distutils2: patch to work with Python2 (only), until the issue http://bugs.python.org/issue17002 is resolved upstream
v4l-utils: update to version 0.9.3

This update fixes the build of the SANE back and front-ends.
haskell-certificate: update to version 1.3.5
haskell-hakyll: update to version 4.1.1.0
haskell-highlighting-kate: update to version 0.5.3.5
haskell-pandoc-types: update to version 1.10
haskell-pandoc: update to version 1.10
haskell-tls-extra: update to version 0.6.1
haskell-yst: update to version 0.3.1
haskell-hlint: update to version 1.8.41
pythonPackages: use pygobject and pygtk of same python version
python: nose2, nose2Cov and covCore
Fixing mcelog, so it puts the proper files in share/doc

It was running "cp mce.pdf $out/share/doc", which created the file 'doc'.
Then buildEnv complained that 'share/doc' exists.