New add row api

[root-11]

Users have reported that add_row is clunky to work with. Hence the following API is suggested:

Example:

    t = Table()
    t.add_column('A', int)
    t.add_column('B', int)
    t.add_column('C', int)

The following examples are all valid and append the row (1,2,3) to the table.

    t.add_row(1,2,3)
    t.add_row([1,2,3])
    t.add_row((1,2,3))
    t.add_row(*(1,2,3))
    t.add_row(A=1, B=2, C=3)
    t.add_row(**{'A':1, 'B':2, 'C':3})

The following examples add two rows to the table

    t.add_row((1,2,3), (4,5,6))  # adds two rows.
    t.add_row([1,2,3], [4,5,6])
    t.add_row({'A':1, 'B':2, 'C':3}, {'A':4, 'B':5, 'C':6}) # two (or more) dicts as args.
    t.add_row([{'A':1, 'B':2, 'C':3}, {'A':1, 'B':2, 'C':3}]]) # list of dicts.

Please vote & comment.

[root-11]

Done in e09c4ee

[root-11]

Packaged to pypi as https://pypi.org/project/tablite/2020.10.30.46577/