pamtoqoi, pbmtozinc, ppmtoarbtxt, qoitopam, rawtopgm, rawtoppm: add pages (#11401)

pages/common/rawtopgm.md

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+# rawtopgm
+
+> Convert a raw greyscale image to a PGM image.
+> More information: <https://netpbm.sourceforge.net/doc/rawtopgm.html>.
+
+- Convert a raw greyscale image to a PGM image:
+
+`rawtopgm {{width}} {{height}} {{path/to/image.raw}} > {{path/to/output.pgm}}`
+
+- Convert a raw greyscale image to a PGM image, assume the image to be a square:
+
+`rawtopgm {{path/to/image.raw}} > {{path/to/output.pgm}}`
+
+- Convert a raw greyscale image in which the pixels come bottom-first instead of top-first to a PGM image:
+
+`rawtopgm {{width}} {{height}} -bottomfirst {{path/to/image.raw}} > {{path/to/output.pgm}}`
+
+- Ignore the first n bytes of the specified file:
+
+`rawtopgm {{width}} {{height}} -headerskip {{n}} {{path/to/image.raw}} > {{path/to/output.pgm}}`
+
+- Ignore the last m bytes of each row in the specified file:
+
+`rawtopgm {{width}} {{height}} -rowskip {{m}} {{path/to/image.raw}} > {{path/to/output.pgm}}`
+
+- Specify the maxval for the grey values in the input to be equal to N:
+
+`rawtopgm {{width}} {{height}} -maxval {{N}} {{path/to/image.raw}} > {{path/to/output.pgm}}`
+
+- Specify the number of bytes that represent each sample in the input and that the byte-sequence is to be interpreted as little-endian:
+
+`rawtopgm {{width}} {{height}} -bpp {{1|2}} -littleendian {{path/to/image.raw}} > {{path/to/output.pgm}}`