Move old tutorials to their own folders

tutorial/CMakeLists.txt

tutorial/ex1/CMakeLists.txt

tutorial/ex1/README.md

tutorial/tutorial_implicit/CMakeLists.txt

...icit/solutions_implicit/ex1b_tutorial_implicit.input.diff

...cit/solutions_implicit/ex1b_tutorialproblem_implicit.diff

...cit/solutions_implicit/ex1c_tutorialproblem_implicit.diff

...cit/solutions_implicit/ex1d_tutorialproblem_implicit.diff

...cit/solutions_implicit/ex1e_tutorialproblem_implicit.diff

...lutions_implicit/ex1f_tutorialspatialparams_implicit.diff

...lutions_implicit/ex1g_tutorialspatialparams_implicit.diff

...licit/solutions_implicit/ex2_tutorial_implicit_input.diff

...plicit/solutions_implicit/ex2_tutorialproblem_implicit.hh

.../solutions_implicit/ex2_tutorialspatialparams_implicit.hh

...l_implicit/solutions_implicit/ex3_tutorial_implicit.input

...icit/solutions_implicit/ex3_tutorialproblem_implicit.diff

...olutions_implicit/ex3_tutorialspatialparams_implicit.diff

tutorial/tutorial_implicit/solutions_implicit/ex4_benzene.hh

...icit/solutions_implicit/ex4_tutorialproblem_implicit.diff

...l_implicit/solutions_implicit/ex5_tutorial_implicit.input