improve validation of page structure
edit forms extend *AddForm::assignVariables()
clipboard actions for pages
Merge pull request #53 from ray176/validatePagePositionImprovement

improve validation of page structure
Merge pull request #54 from ray176/codeImprovement-controllerAssignVariables

edit forms extend *AddForm::assignVariables()
Merge pull request #56 from ray176/stylesheetClipboardActions

clipboard actions for pages