add vimsession plugin
remove plugin management
add new plugin management
handle filetype settings with augroups

This improves the overview of what is loaded/set when.
Don't link vimrc

This is not necessary, since vim reads $HOME/.vim/vimrc automatically, if
$HOME/.vimrc does not exist.
use per directory vimrcs instead of local vimrc
disable modelines

use per directory vimrcs instead
integrate plugin config in to vimrc
fix plugin configuration
add extended cpp syntax
add slimux plugin
add gundo only if python is supported
remove vimsession plugin
and we're back at submodules

I really should settle on one method to "manage" my bundles.
add bundles as submodules