Parse of tables with arbitrary vertical separators

[dwesely]

• Identifies vertical separators by recursing through the array to find repeated characters. Does not yet handle spaces as a vertical separator.
• Allows user-input character for the output separator (so creating csvs is possible, just put a comma in the Custom Separator box before pasting in the text to parse)
• Added error messages to describe parsing failures.
• Returns original input (sans separator lines) if a parsing error occurs, so it is less likely that the output will be overwritten automatically if the user changes a setting accidentally.
• Corrected typo in isSeparatorLine function name.

This is in response to #20, but still does not handle parsing of html or wikimedia tables.

[ozh]

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