Updated p5-Image-Size to 2.980 (provided by Shell Hung in pkg/15873)

* From tips provided by Philip Newton after a close reading of the manual page
  and other docs, several typos and errors were cleared out, and a small
  buglet in the error message within bmpsize() was corrected.

* Moved the code that changes a relative filename to an absolute one. This
  was being called in all cases, now it is *not* called if cacheing is
  disabled (via $NO_CACHE). This is for the sake of applications running in
  environments where they may have trouble with full paths (due to "lockbox"
  configurations).

* Made a few adjustments to the docs per suggestion, to clarify some of the
  usage cases.

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