Closes #1689 - Adds support for DataFrame to generic attach #1798
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This PR closes #1689
On the chapel side, the symbol table proc
findAll
has been modified to return the matching portion of the regex instead of the entire string that was searched. This allows for more flexibility in searches. The DataFrame attach proc uses the existing attach processes for Strings, pdarray, Categorical, and SegArray to build it's return message.On the python side the function from_return_msg has been added to DataFrame as well as a helper function that is used to parse the column name out of the registry entry name.