Hardcopy of pybind11 instead of using git submodules (#552)

* removed pybind as submodule
* added hardcopy of pybind11 2.10.0
* rename pybind11 folder to avoid conflicts when changing branch

Co-authored-by: Dhanya Thattil <dhanya.thattil@psi.ch>

libs/pybind/tests/test_docstring_options.py

@@ -0,0 +1,41 @@
+from pybind11_tests import docstring_options as m
+
+
+def test_docstring_options():
+    # options.disable_function_signatures()
+    assert not m.test_function1.__doc__
+
+    assert m.test_function2.__doc__ == "A custom docstring"
+
+    # docstring specified on just the first overload definition:
+    assert m.test_overloaded1.__doc__ == "Overload docstring"
+
+    # docstring on both overloads:
+    assert m.test_overloaded2.__doc__ == "overload docstring 1\noverload docstring 2"
+
+    # docstring on only second overload:
+    assert m.test_overloaded3.__doc__ == "Overload docstr"
+
+    # options.enable_function_signatures()
+    assert m.test_function3.__doc__.startswith("test_function3(a: int, b: int) -> None")
+
+    assert m.test_function4.__doc__.startswith("test_function4(a: int, b: int) -> None")
+    assert m.test_function4.__doc__.endswith("A custom docstring\n")
+
+    # options.disable_function_signatures()
+    # options.disable_user_defined_docstrings()
+    assert not m.test_function5.__doc__
+
+    # nested options.enable_user_defined_docstrings()
+    assert m.test_function6.__doc__ == "A custom docstring"
+
+    # RAII destructor
+    assert m.test_function7.__doc__.startswith("test_function7(a: int, b: int) -> None")
+    assert m.test_function7.__doc__.endswith("A custom docstring\n")
+
+    # when all options are disabled, no docstring (instead of an empty one) should be generated
+    assert m.test_function8.__doc__ is None
+
+    # Suppression of user-defined docstrings for non-function objects
+    assert not m.DocstringTestFoo.__doc__
+    assert not m.DocstringTestFoo.value_prop.__doc__