egPalAll()

         Gets/Sets the RGB values for all palettes

    Syntax:

         egPalAll( [cPalette] ) -> cOldPalette

         cPalette : A 768 byte string that indicates the attributes of the
                    different palettes in the format:

                                   Attribute 0              Attribute 15
                                 Red Green Blue  ... ...   Red Green Blue

                     Palette  0  byte byte  byte  ... ...  byte byte  byte
                        ...      ...  ...   ...   ... ...  ...  ...   ...
                     Palette 15  byte byte  byte  ... ...  byte byte  byte

    Description:

         gPalAll() lets change or inform about the attributes of all the
         system palettes.

    Return:

         A 768 byte string with information related to  the attributes of
         the different system palettes.

    Example:

         cAtributos := Replicate ( Chr(0) + Chr (63) + Chr(0), 16 )
         cPalettes  := egPalAll( Replicate ( cAtributos, 16 ) )
         Inkey(0)
         // Set all the palette colours to Green.
         egPalAll( cPalettes )