Add javadoc and test of the share operator.
Optimize subsequent operators of concatenated sequence.
Add javadoc and test of the isPrefixOf operator.
Add javadoc and test of the isInfixOf operator.
Rename internal method in tune with the corresponding public method.
Add javadoc and test of the containsSequence operator.
Add javadoc and test of the disjoint operator.
Add javadoc and test of the startsWith operator.
Commonalize implementation of startsWith & isPrefixOf.
Optimize isPrefix|isSuffix|startsWith|endsWith of FiniteSeq.
Add javadoc and test of the endsWith operator.
Hide implementation.
Add javadoc of the as(Sequential|Parallel|OrderedParallel) operator.
Add javadoc and test of the (left|right)OuterJoin operator.