bugfix: text clickable without checkbox

text should be clickable only when checkbox is rendered.
add option for lists 'header'-rendering

* add option for list view, how header will be rendered, As ID (default) or as FIRSTHEADER
  header:id|firstheader
Update list.php
Update list.php
Update plugin.info.txt
add options for list rendering

header:id|firstheader
Update settings.php

new options
Update settings.php

new options
Update metadata.php

new options
Update default.php

new options
Update default.php

new options
Update list.php

new options, default values
Update settings.php
Update settings.php
in list view show link to page 

show the innertext of a todoitem as a link to the page where the todo is located
show list view without header

for the option 'header' add the value 'none' to hide the header in list views
in list view show link to page

show the innertext of a todoitem as a link to the page where the todo is located
Update metadata.php

new value for $meta['Header']
Update settings.php

new value 'none' for $lang['Header']
Update settings.php

new value 'none' for $lang['Header']