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.
Fixed tinc license.
tinc: GPLv2+, not GPLv2.
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.
Add myself as (additional) maintainer to all python packages.
python-mrbob: add missing dependency
pythonPackages26 fixes
python-ipdb
python-coverage-3.6
nose2Cov does not create pth for deps - propagate manually
buildPythonPackage defaults to python.meta.platforms
perl package version maintenance as those packages are needed by wget and its dependencies
some tests for nettle and gnutls donot seem to work on OS X
perl-packages: remove 'HTTPParser' attribute, which is a duplicate of 'HTTPMessage'
perl-Net-OpenID-Consumer: add missing dependency on 'LWP'
haskell-JuicyPixels: update to version 3.0
haskell-hakyll: update to version 4.1.2.0
haskell-mongoDB: update to version 1.3.2
haskell-pandoc: update to version 1.10.0.4