REPO-1228 resolve paths relative to the source root: . refers to the copy root instead of its parent. This makes the _name a pseudo property. Patterns like ./_name/subpath are therefore no longer valid (since properties don't have children). Also the new-image template had an invalid hippostd:modify pattern, this is removed because it was not used anyway (the lastModified property is set in another way). Also added a groovy script to detect invalid hippostd:modify paths.