Set runtime.currentDirectory/libraryPaths in faked webodf.js for out-of-source runs

Frees "production" code from adjustments for out-of-source developer code
Fix broken automatic loading of manifest.json at script location when executing runtime

* Fix extracting the path from a script passed as arg to runtime
* Allow failing on trying to load a manifest file from the current directory
Remove duplicated runtime.libraryPaths setting in docnosis/index.html
Merge pull request #399 from kossebau/cleanupRuntimeLibraryPaths

Fix broken automatic loading of manifest.json at script location when executing runtime & cleanup
Normalize lookup paths in updateJS
Merge pull request #404 from peitschie/jsfilelist-windows

Normalize lookup paths in updateJS
Add getElementsByTagName to DomUtils.
Remove dangerous <script/> and <style/> tags before inserting XML into the dom.
<script/> tags are executed when inserted into the DOM. This is unwanted, so they are are removed before the XML is inserted into the DOM.
In addition, <style/> elements can be used to execute code, so they are removed too.