Removed all configurations that explicitly test or set the c++ standard
flags. The only place the standard is now configured is at the top of
the main `CMakeLists.txt` file, which can easily be updated (e.g. if
we decide to move to c++14+). This can also be set via command-line using
```
> cmake -DCMAKE_CXX_STANDARD 14
```

Kept the `EIGEN_TEST_CXX11` flag for now - that still controls whether to
build/run the `cxx11_*` tests.  We will likely end up renaming these
tests and removing the `CXX11` subfolder.

UTF-8, LF, no BOM, and newlines at the end of files

- {1,2,3,4,5,...} for fixed-size vectors only
- {{1,2,3},{4,5,6}} for the general cases
- {{1,2,3,4,5,....}} is allowed for both row and column-vector

Each test is now a normal ctest target, and build properties (compiler+flags) are preserved (instead of starting a new build-dir from scratch).

bug #1005: fix regression regarding sparse coeff-wise binary operator that did not trigger a static assertion for mismatched storage

failtest: a new cmake-based test suite for testing stuff that should fail to build. This first batch imports some const correctness checks from bug #54.