Post refactor dataframe (#296)

* Add Mesh.node_ids

* Fix if evaluations in MechanicalSimulation._build_selection

* Return first principal component by default if None is asked (combination of all three is not possible yet)

* Add animation on deformed mesh

* Add Mesh._core_object and DataObject._core_object

* Add typehinting to Simulation.time_freq_support

* Add Simulation.set_ids

* Add Simulation.release_streams()

* Add DataFrame._core_object and Mesh._core_object

* Add Mesh.__str__

* Rename DataObject to DataFrame

* Add DataFrame.__str__ and remove DataFrame.to_pandas and to_numpy

* Allow import DataFrame from post

* Add display_width logic to the Dataframe string representation

* Finish renaming to DataFrame

* Add testing to DataFrame

* Update Mesh.__str__

* Update DataFrame signature

* Finish testing Mesh methods

* Fix Mesh.available_named_selections docstring

* Remove useless tests for Simulation.boundary_conditions and Simulation.loads as these properties are not implemented yet.

* Fix Codacy

* Add Index and MultiIndex

* Add ResultsIndex

* Update Index and MultiIndex APIs and update DataFrame API

* Update DataFrame._update_str

* Add DataFrame.select

* Update DataFrame.plot() to accept selection arguments.

* Add DataFrame.iselect

* Update Index classes and DataFrame creation. Refactor components treatment and DataFrame creation in result APIs

* Add component selection to DataFrame.select

* Add component selection to DataFrame.iselect

* Working DataFrame.__str__

* Working DataFrame.__str__

* First fix for harmonic

* Move all to using "set_id" axis instead of time.

* Fix component indexing for matrices

* Print elemental nodal results.

* Fix print elemental nodal results.

* Raise on element selection for elemental_nodal results

* Fix problem on post to not require fixing core

src/ansys/dpf/post/__init__.py

@@ -14,7 +14,7 @@
 """
 
 import ansys.dpf.core as core
-from ansys.dpf.core.common import locations
+from ansys.dpf.core.common import locations  # noqa: F401
 
 try:
     import importlib.metadata as importlib_metadata
@@ -23,6 +23,7 @@
 
 from ansys.dpf.post import mesh, selection, tools
 from ansys.dpf.post.common import Grouping as grouping
+from ansys.dpf.post.dataframe import DataFrame  # noqa: F401
 from ansys.dpf.post.dpf_path import create_path_on_coordinates
 from ansys.dpf.post.misc import Report
 from ansys.dpf.post.post_utility import (