check weblink (check_weblink.java): -----------------------------
Using class 'com.pdflib.pdflib' for running Cookbook example (pCOS Interface 13)
Link check for file: '../input/pCOS-path-reference.pdf'
Page 2:
  https://www.pdflib.com
    [200] OK
  mailto:sales@pdflib.com
    [405] Not a Web link
  mailto:support@pdflib.com
    [405] Not a Web link
Page 3:
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  https://www.pdflib.com/pcos-cookbook/
    [200] OK
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