Improve the creation of instance objects

[Volker Simonis]

Hi Alexey,

thanks for creating the JOL-tools - they are really nice.

I've played around with them and I want to propose the following small
patch which improves the creation of instance objects.

Currently you are using Class.newInstane() but this will fail if the
default constructor is not accessible.
I'd like to propose the usage of Class.getDeclaredConstructor() to get
the default constructor. If it is not accessible we can set it to
'true' with ctor.setAccessible(true). Afterwards we can simply call
ctor.newInstance().

What do you think? With these small changes I could get some better
results when calling MainObject{Internals, Externals, Footprint} on
some classes which only had private constructors.

S novem godom,
Volker
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