Get rid of System.out and System.err in v0.1.3

[Richard Gomes]

Classes should never call System.out and/or System.err directly

Please remove code which makes use of System.out and/or System.err directly, moving it to the testsuite folder or project jquantlib-samples, according to what looks more convenient.

The only class allowed to call System.err directly (but not System.out directly!) is QL.java, which is responsible for delegating messages to a org.slf4j.Logger class and, if not present, emits logging messages directly to System.err.

<b>Classes calling System.out</b>
<pre>
GeneralStatistics
GenericSortingAlgorithms
PairSortingAlgorithms
SortingAlgorithms
</pre>

[Richard Gomes (frgomes)]

These classes need to be finished.

There are main() methods in the referenced classes.
I've added some comments and made sure they cannot be instantiated by accident.

Kicked to v0.1.4