Add more modifying accessors to DataFrame

[olekscode]

There are accessors like

df rows: arrayOfRowNames.
df rowsAt: arrayOfNumbers.
df rowsFrom: firstNumber to: secondNumber.

df columns: arrayOfColumnNames.
df columnsAt: arrayOfNumbers.
df columnsFrom: firstNumber to: secondNumber.

But no modifiers like

df rows: arrayOfRowNames put: arrayOfRows.
df rowsAt: arrayOfNumbers put: arrayOfRows.
df rowsFrom: firstNumber to: secondNumber put: arrayOfRows.

df columns: arrayOfColumnNames put: arrayOfColumns.
df columnsAt: arrayOfNumbers put: arrayOfColumns.
df columnsFrom: firstNumber to: secondNumber put: arrayOfColumns.

It's very easy to add them