XPLANBOX-2652 - removed Gueltigkeitszeitraum (code and documentation)

...n/xplan/commons/feature/FeatureCollectionManipulator.java

...e/latlon/xplan/manager/web/shared/AdditionalPlanData.java

.../latlon/xplan/manager/web/shared/edit/ValidityPeriod.java

.../de/latlon/xplan/manager/web/shared/edit/XPlanToEdit.java

...main/java/de/latlon/xplan/core/manager/db/model/Plan.java

...java/de/latlon/xplan/manager/database/XPlanDbAdapter.java

...ava/de/latlon/xplan/manager/database/XPlanManagerDao.java

...java/de/latlon/xplan/manager/edit/XPlanToEditFactory.java

...de/latlon/xplan/manager/transaction/XPlanEditManager.java

...xplan/manager/transaction/service/XPlanInsertService.java

xplan-database/xplan-database-docker/pom.xml

xplan-docker/xplan-docker-volume-init/pom.xml

.../asciidoc/konfiguration/manager/gueltigkeitszeitraum.adoc

...andbuch/src/main/asciidoc/konfiguration/manager/main.adoc

.../xplanbox/api/manager/handler/EditGueltigkeitHandler.java

...de/latlon/xplanbox/api/manager/v1/PlanGueltigkeitApi.java

...ava/de/latlon/xplanbox/api/manager/v1/model/Zeitraum.java

...fig/src/main/resources/managerWebConfiguration.properties

...lon/xplan/manager/web/client/gui/ImportWizardCreator.java

...tlon/xplan/manager/web/client/gui/PlanListColumnType.java