(refactoring)VarEntry<->double utility

VarEntry.valueOf(double)
VarEntry#toReal()
VarEntryTest(all tests succeed)
AllTests(succeeds)
(refactoring)CallStack
(refactoring) constant pool (ClassLoader,ClassData, etc.)

Moved code of constant pool initialization
Added some tests.
(refactoring)(minor) CPUTest

CPUTest.toVar -> VarEntry.valueOf(double)
Size of VariableTable

New member methodNumberOfVariable
Created new tests(ClassLoaderTest#getemptyBCD)

In progress...(1)