Property List Functions

(get <sym> <prop>)  GET THE VALUE OF A PROPERTY
    <sym>       the symbol
    <prop>      the property symbol
    returns     the property value or nil

(putprop <sym> <val> <prop>)  PUT A PROPERTY ONTO A PROPERTY LIST
    <sym>       the symbol
    <val>       the property value
    <prop>      the property symbol
    returns     the property value

(remprop <sym> <prop>)  REMOVE A PROPERTY
    <sym>       the symbol
    <prop>      the property symbol
    returns     nil