* Impl of IMethod isSynthetic and isWalaSynthetic
So far IMethod.isSynthetic referred to WALA-generated helper functions
and there was no equivalent to check whether an IMethod is synthetic in
terms of compiler-generated.
To make naming consistent this patch first renames the isSynthetic to
isWalaSynthetic to clearly indicate that a given IMethod was generated
by WALA. Then, we re-introduce isSynthetic that from now on checks
whether an IMethod is synthetic/compiler-generated (referring to the
synthetic flag in bytecode)
* Implementation of IClass.isSynthetic
Complementary to IMethod.isSynthetic, this method checks whether
an IClass is compiler-generated.
* updated JavaDoc
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