On branch master
 Changes to be committed:
	modified:   LiSP_ch1.ml
    Removed requirement for SymGen modules to have a function to convert
    symbols to integers.

	modified:   LiSP_ch1.mli
    Removed requirement for SymGen modules to have a function to convert
    symbols to integers.

	modified:   testing/test.ml
    Modified the SymGen module to implement interned symbols.