Bugfix Get gdrive instances (#554, #525)

Metadata.db download works again
removed DEVELOPMENT constant
removed db logging in debug mode (too, noisy, to less information)
code refactoring url_for_other_page
feed languge set to en-EN
update status shos local time instead of UTC
Error handling (back to index page) in case of gdrive authenticate aborted
Mistyping page register fixed
Mistyping bokk fixed
Added uploaded books to tasklist (#442)
Error handling for failed file update added
Code refactoring worker thread
Tasks now never show any decimal values
Converter function unified
removed shell from subprocess call
preparation for limiting domain for registering emails
Book series can now increased in 0.1 steps (#562)
Accordion panels in config are now usable on touch devices like iPad (#545)
Gdrive authenticate button only visible after logged in (#525)
Fixed misstyping in german translation

cps/templates/config_view_edit.html

@@ -7,10 +7,10 @@
   <div class="panel panel-default">
     <div class="panel-heading">
       <h4 class="panel-title">
-        <div class="accordion-toggle" data-toggle="collapse" href="#collapsefour">
+        <a class="accordion-toggle" data-toggle="collapse" href="#collapsefour" style="text-decoration:none;">
           <span class="glyphicon glyphicon-plus"></span>
           {{_('View Configuration')}}
-        </div>
+        </a>
       </h4>
     </div>
     <div id="collapsefour" class="panel-collapse collapse">
@@ -57,10 +57,10 @@
   <div class="panel panel-default">
     <div class="panel-heading">
       <h4 class="panel-title">
-        <div class="accordion-toggle" data-toggle="collapse" href="#collapsesix">
+        <a class="accordion-toggle" data-toggle="collapse" href="#collapsesix" style="text-decoration:none;">
           <span class="glyphicon glyphicon-plus"></span>
           {{_('Default settings for new users')}}
-        </div>
+        </a>
       </h4>
     </div>
     <div id="collapsesix" class="panel-collapse collapse">
@@ -99,10 +99,10 @@
   <div class="panel panel-default">
     <div class="panel-heading">
       <h4 class="panel-title">
-        <div class="accordion-toggle" data-toggle="collapse" href="#collapseseven">
+        <a class="accordion-toggle" data-toggle="collapse" href="#collapseseven" style="text-decoration:none;">
           <span class="glyphicon glyphicon-plus"></span>
           {{_('Default visibilities for new users')}}
-        </div>
+        </a>
       </h4>
     </div>
     <div id="collapseseven" class="panel-collapse collapse">