Tree table view support for Dictionary and OrderedDictionary

Support for decorating PBArrayND table column names

Improvements for accessing elements of an N-dimensional array

Bug fixes and updates for Pharo 13+ support

update README for v0.5.0

bump version to v0.4.1 in README

bump latest release to v0.4.0 in README

refactor PBRDFLib to include exception handling

- PBRDFLib sends message to PBPython for handling generic python code execution from a string via SystemInteraction
- PBPython raises an Error if a traceback is encountered while executing python code

revise notes and Example Usage

- replace 'text' with 'code'
- add verbiage and notes for evaluating and inspecting results in Example Usage

add Array2D>>inspectorExtension