added composition SLO and penalty per time unit

examples/tools.descartes.dql.lang.examples/GOALS/example.dql

...ui/contentassist/AbstractDescartesQLProposalProvider.java

...es/dql/lang/ui/contentassist/antlr/DescartesQLParser.java

...ang/ui/contentassist/antlr/internal/InternalDescartesQL.g

...i/contentassist/antlr/internal/InternalDescartesQL.tokens

...ontentassist/antlr/internal/InternalDescartesQLLexer.java

...ntentassist/antlr/internal/InternalDescartesQLParser.java

...ools.descartes.dql.lang/model/generated/DescartesQL.ecore

...s.descartes.dql.lang/model/generated/DescartesQL.genmodel

...ang/src-gen/tools/descartes/dql/lang/DescartesQL.xtextbin

...ls/descartes/dql/lang/descartesQL/DescartesQLFactory.java

...ls/descartes/dql/lang/descartesQL/DescartesQLPackage.java

...ang/src-gen/tools/descartes/dql/lang/descartesQL/Sla.java

...ang/src-gen/tools/descartes/dql/lang/descartesQL/Slo.java

...src-gen/tools/descartes/dql/lang/descartesQL/SloComp.java

...rc-gen/tools/descartes/dql/lang/descartesQL/TimeUnit.java

...c-gen/tools/descartes/dql/lang/descartesQL/Violation.java

...tes/dql/lang/descartesQL/impl/DescartesQLFactoryImpl.java

...tes/dql/lang/descartesQL/impl/DescartesQLPackageImpl.java

...en/tools/descartes/dql/lang/descartesQL/impl/SlaImpl.java