Add smw.dataItem.wikiPage.getText()

* wikiPage.getText() outputs text without hash fragment;in-page
objects such as subobjects (Foo#_QUERY9a665a578eb95c1) now are
displayed with its base page text (Foo)
* Fix some docs (JSDuck)
* Add tests (total of 74 tests)

Change-Id: I0a355ebd7ee03ab30467ef510ff97da34ac2877a