Txtble

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- Added `left_border`, `right_border`, `top_border`, and `bottom_border`
options

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- Added a `len_func` option, allowing the user to specify a custom function for
calculating text width
- Added a `with_color_stripped` function decorator for use by custom
`len_func`s
- Added `widths` and `width_fill` options for wrapping columns to fixed widths
- Added `break_long_words` and `break_on_hyphens` options for controlling text
wrapping
- Added a `wrap_func` option, allowing the user to specify a custom function
for wrapping text

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- Added ANSI color escape sequence support

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- Added `align` and `align_fill` options

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- Added `left_padding` and `right_padding` options

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- Table cell values that begin with a combining character will now have a space
prepended
- Added a `padding` option
- Strings with indeterminate widths now cause an `IndeterminateWidthError` to
be raised
- `'\f'` and `'\v'` are now always treated as line separators, even inside
`str` objects in Python 2