Remove the non-existant --get-alias-set option from the help text.

Remove the non-existant --get-alias-set option from the help text.

Update printPixelFunction (which is only used to generate code for the
server-side) to use the correct method for obtaining the dimensions of the
image parameter to a function.

Only use byteswap.h when building generated code on Linux.  Elsewhere use
the (horrible!) macros from X11/misc.h.

Make sure that enums associated with the generic "Get" function get applied
to GetIntegerv, GetBooleanv, GetFloatv, and GetDoublev.