Updated statismo to use C++11

[muefra]

• Mostly removed boost (it is still used for the CLI tools)
• Updated CMake files to reflect those changes
• Superbuild update:
  • Removed git as a dependency: speeds up source downloads
  • Update of dependencies (HDF5 is still on 1.8.X, support for 1.10 will be in a separate pull request)
• Added ability to statically initialize PRNG (more reliable unit tests)
• Fixed 1 Unit test (switched to relative error instead of absolute error when comparing floats to account for limited numerical accuracy)

[muefra]

Seems that the ITK bundled with ubuntu trusty is a bit old and doesn't like C++11 (Didin't notice this prior to the PR because I tested it on ubuntu xenial)

I'll look into this in the evening.

[muefra]

Well, as it turns out ubuntu 14.04 is a bit old (eg: per default cmake ist still on version 2.8; interestingly enough the travis image seems to come with a newer cmake version though).

Got it to work regardless, although using -fpermissive for gcc to swallow the old dependencies of the old itk version isn't particularly pretty. Using the superbuild on travis would be a bit slow, so it'll have to suffice.

I also added make test to run to unit tests after the build.

[marcelluethi]

@muefra Thank you very much for this very extensive set of changes. It will greatly simplify things. As there are so many changes, it might take a week or two before I can have a careful look.

[normanius]

Looks okay for me on MacOS with clang++ and even ccache+clang++. The only thing I noticed are some warning messages arising from ITK. For example:

In file included from ../modules/ITK/examples/itkBuildGaussianProcessDeformationModel.cxx:46:
../modules/ITK/include/itkStandardImageRepresenter.h:151:24: warning: 'CloneDataset' overrides a member function but is not marked 'override' [-Winconsistent-missing-override]
    DatasetPointerType CloneDataset(DatasetConstPointerType d) const;
                       ^
../modules/core/include/Representer.h:190:32: note: overridden virtual function is here
    virtual DatasetPointerType CloneDataset(DatasetConstPointerType d) const = 0;
                               ^

I think this is only related to ITK and not to statismo. One could silence this by adding a line add_compile_options("-Wno-inconsistent-missing-override") in the main CMakeLists. I didn't find a way to silence only the ITK-related warnings. (include_directories(SYSTEM ${ITK_INCLUDE_DIRS} ) didn't work for me.

Suggested fix:

if( ${ITK_SUPPORT} MATCHES "ON" )
  find_package( ITK REQUIRED PATHS ${INSTALL_DEPENDENCIES_DIR})
  include( ${ITK_USE_FILE} )
  #include_directories(SYSTEM ${ITK_INCLUDE_DIRS} )
  add_compile_options("-Wno-inconsistent-missing-override")
endif()