introducing googletest

probably going to switch from QTest to gtest for its mocking abilities
adjusting gtests for conditional compilation
converted ThingTests to gtest

and some CMake output tweaks
filename pattern fix; adding forgotten files
ignore Eclipse build dirs
converted UserTests; streamlined CMake; made filenames consistent
fix cmake

should test the tests in the future
fixing stuff; especially with authorization

Basic authorization with username and password works now fine by passing
them in the form USERNAM:PASSWORD as base64 encoded strings in the header
field "Authorization" together with the prefix "Basic ".
This method forces the usage of the credentials as a POST request does
not automatically trigger the authorizationRequired slot.

also improved and added some debugging information along the way
removing configured test user password header
fixing CMake and ignores
adding netio::utils tests
fix compile failure for no-grouped tests
forgot to add netio_util testdata
converting NetworkTest to gtest
adjusting/improving grouped tests
Merge branch 'gtest' into network-rewrite