Issue 29 - Either get rid of getVariableData or introduce a hint annotation

["Yaron Goland" <ygoland@bea.com>]

If we don't decide to ban the ability to specify non-static strings as the
arguments to getVariableData and related functions then we need to introduce
an attribute that can be applied to variables as a 'hint' that these
variables should be persisted for compensation purposes. We will also have
to introduce a new fault if, at runtime, an attempt is made to access a
variable that wasn't marked for persistence.

	Thanks,
		Yaron

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