cleanup server statistics page; remove unused .js and .css files; fix the sortable table; add new columns
add a class which can create locks that work between multiple processes

The class currently only supports Unix systems. On other platforms, a
warning is logged once; otherwise any locking attempts will silently be ignored.
add locks to management commands which often run in different processes

Currently only locking for basic storage operations is performed.
make sure to (more) correctly import `xs:anyURI` values from XML

If we have an `xs:anyURI` value, then it must be a URI according to RFC
2396 or it must result in such a URI after applying the algorithm from
<http://www.w3.org/TR/2001/REC-xlink-20010627/#link-locators>. So far we
have not verified this, i.e., we have imported unprocessed `xs:anyURI`
values but always treated them as valid URIs.
change the used validator for URI values in our models

Using a `URLValidator` here is probably the best trade-off between a
fully correct URI validator (plus our XML Schema constraints) and
simplicity/maintainability. In addition, the `URLValidator` probably
comes closer to the “intended” validation requirements of the XML Schema
authors than a standards compliant URI validator.
upgrade Selenium to the latest version in order to support Firefox 17
fix test: editing in the popup window has to be cancelled (not saved)

No data is input in the popup, i.e., when trying to save, the editor
shows validation errors. No idea why this has worked previously …
clarify URL format in example settings
Added error handling when a resource cannot be imported.
An aisthetic change in the synchronization script.
Added report for successful and failed synchonized resources.
Took back minor changes that broke things.
Fixed error.
make window closing/switching code more robust

The code didn’t reliably work with the latest Firefox and Selenium
webdriver versions.
use more specific XPath expressions for element selection
disable Selenium tests due to reliably problem with Firefox 17

There is a bug in Selenium which causes random test failures with FF 17,
see <http://code.google.com/p/selenium/issues/detail?id=4814>. The tests
should be reenabled again as soon as there is a new Selenium release
which fixes the bug.
Merge pull request #701 from cspurk/various-improvements

(1) temporarily disable Selenium tests; (2) improve `xs:anyURI` value handling; (3) add locks to management commands which often run in different processes; (4) some more smaller improvements
integrate Google Analytics tracking on the META-SHARE portal page
integrate Google Analytics tracking for all META-SHARE sites by default

The Installation Manual contains information on how to change this
default setting. The Terms of Service are changed accordingly (already
approved by the META-SHARE legal team).
add terms of service for non-registered users to the META-SHARE website

Also make sure to provide a link to the currently relevant terms of
service on all pages in the footer.