pdftotext: Add "-table" switch from Xpdf's pdftotext

Submitted by bar..@..il.com

Assigned to poppler-bugs

Created attachment 139350 Output from Xpdf's pdftotext using the "-table" switch

The "-table" switch behaves similarly to the current "-layout" switch but better maintains table structure.

Attachment 139350, "Output from Xpdf's pdftotext using the "-table" switch":
xpdf-with-table-switch.txt

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