read multiple alternative identifiers
Merge branch 'master' into multipleAlternativeIdentifier-29
added constant to detect a multiple alternative identifier
added property to read tooltip
assume null as default value
add TooltipName as ResultProperty
Repaired sorting of layertree nodes
Merge pull request #5 from lat-lon/multipleAlternativeIdentifier-29

Multiple alternative identifier 29
Merge branch 'master' into layerTree-25
Merge branch 'master' of https://github.com/lat-lon/deegree2-rev30957
Merge branch 'master' into layerTree-25