Add documentation for boundary creater, checker

.../fgbks/base/utils/boundary/bicreater/BiCreaterAppend.java

...fgbks/base/utils/boundary/bicreater/BiCreaterBetween.java

...fgbks/base/utils/boundary/bicreater/BiCreaterCombine.java

.../base/utils/boundary/bicreater/BiCreaterIntersection.java

...s/base/utils/boundary/bicreater/BiCreaterLowerBounds.java

.../base/utils/boundary/bicreater/BiCreaterStringAppend.java

...base/utils/boundary/bicreater/BiCreaterStringBetween.java

...base/utils/boundary/bicreater/BiCreaterStringCombine.java

...utils/boundary/bicreater/BiCreaterStringIntersection.java

.../utils/boundary/bicreater/BiCreaterStringLowerBounds.java

.../utils/boundary/bicreater/BiCreaterStringUpperBounds.java

...s/base/utils/boundary/bicreater/BiCreaterUpperBounds.java

...gbks/base/utils/boundary/bicreater/BoundaryBiCreater.java

.../base/utils/boundary/bicreater/BoundaryBiCreaterType.java

...z/fgbks/base/utils/boundary/bicreater/EmptyBiCreater.java

...lenz/fgbks/base/utils/boundary/checker/BoundaryCheck.java

.../fgbks/base/utils/boundary/checker/BoundaryCheckType.java

...koblenz/fgbks/base/utils/boundary/checker/CheckEqual.java

...enz/fgbks/base/utils/boundary/checker/CheckInContact.java

...fgbks/base/utils/boundary/checker/CheckIsSubsumption.java