Updates da_DK
Updates Spanish translation
Don't attempt to load group-specific content on Edit screen. See #285
Don't attempt to show group permissions stuff when groups are disabled

Fixes #285
Readme updateh
In bp_docs_set_associated_group_id(), wipe out existing terms when setting group

Originally, this function was architected to allow for Docs to be associated
with more than one group. However, this feature was never built into the UI
(and probably won't be anytime soon). This changeset means that it's only
possible to associate a Doc with a single group, at least as far as the
function bp_docs_set_associated_group_id() is concerned (unless you pass in
an array for the $group_id).

This prevents problems when the associated group has been changed (previously,
the second group was just being added, rather than replacing the original
group).

See #286
Removes PHP4 constructor
Refactors doc save process to ensure group associations can be unset

Previously, associated group data was saved only when a group ID was found in
the $_POST global. This meant that when no value was sent - you were attempting
to unset the group association - the value was not processed.

This changeset modifies the way associated group data is detected, so that
when no value is passed, a value of 0 is assumed; and when a value of 0 is
passed to bp_docs_set_associated_group_id(), all associations are deleted
from the database for that doc.

Fixes #286
Readme update
Bumps version number to 1.3.1
Merge branch '1.3.x' into 1.4.x
Redirect more intelligently when can't associate with groups

This makes the tests run properly without getting headers already sent messages