remove Java-side accessor primitives from SlotDefinition.java

- Replaced %slot-definition-name, %slot-definition-initfunction,
  %slot-definition-initform, %slot-definition-initargs,
  %slot-definition-readers, %slot-definition-writers,
  %slot-definition-allocation, %slot-definition-allocation-class,
  %slot-definition-location, %slot-definition-type,
  %slot-definition-documentation and the corresponding writers with direct
  slot accesses

- *FASL-VERSION* increased since old fasls contain calls to slot
  accessors