Revert "[common.threadmanager] update include path"

This reverts commit 1e9a2e831336ca7de622b3ea91eb8d0c4706d296.
Merge remote-tracking branch 'tobias/master'
[common.logstreams] fixes #192
[fem.namespace] whitespace
[common.disable_warnings] added -Wuninitialized and -Wlogical-not-parentheses
[common.ranges] disabled some warnings concerning dune-fem
[common.exceptions] added wrong_input_given and you_are_using_this_wrongly
[common.configtree]
* fixed operator+
* fixed report()
[cmake.UseLATEX] removed double license and copyright
[cmake] added support for good old times with -DCMAKE_WITH_AUTOTOOLS=1
[grid.provider.cornerpoint] moved to playground
[license] unified url and fixed some minor typos
[grid] moved to grids
[autotools] removed some Makefile.ams
[examples] removed
[test.grid...] moved to test.grids...
[common.exceptions] added external_error
[common.configtree] vectors are separated by ;
[grids.provider.interface] major rewrite
[grids.provider.cube] update