pamoil, pgmbentley, pgmdeshadow, pgmoil, ppmrainbow, ppmrelief, ppmshadow, ppmshift, ppmspread, ppmtoacad, ppmtobmp, ppmtoicr: add pages (#11433)

pages/common/pamoil.md

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+# pamoil
+
+> Turn a PAM image into an oil painting.
+> More information: <https://netpbm.sourceforge.net/doc/pamoil.html>.
+
+- Turn a PAM image into an oil painting:
+
+`pamoil {{path/to/input_file.pam}} > {{path/to/output_file.pam}}`
+
+- Consider a neighborhood of N pixels for the "smearing" effect:
+
+`pamoil -n {{N}} {{path/to/input_file.pam}} > {{path/to/output_file.pam}}`