col: buffering code broken

[mknos]

• I observed strange output from col when the input file was large
• Finally I discovered the issue is related to code that runs when the buffer fills up
• The input loop adds lines to a buffer which are printed in a subsequent loop; however, the buffer code triggers early printing within the input loop
• I could reproduce error earlier by setting a smaller buffer size with -l: "perl col -l 5 ching"
• The pod manual says -l buffers at least n lines of input
• I propose ignoring -l and buffering the whole file, this at least doesn't result in a runtime error
• Correct buffer management code could be investigated later