Update edit_interface.php

Added missing global. You should get rid of the global stuff, maybe using Zend_Registry
Merge pull request #257 from magicsunday/patch-1

Update edit_interface.php
Fix: DB error in error checker
Fix #259 - block editor gives fatal error
Add menu options to merge and renumber trees
Fix: #1379482 - Monthly Calender Day not set box has vanished
Update .PO files. Fix some minor English grammar.
The next release will be 1.6.0
Upgrade datatables from 1.10.0 to 1.10.3
Makefile - fix for cygwin fails on linux.  Prefer linux.
Updated PL translation by Lukasz
Census assistant adding &nbsp; between names
Shared note titles are escaped twice
Remove random text
Fix #247 - Markdown partially stripped on edit
Dutch language file updated.
Fix #243 - Badges visible in application
Merge pull request #262 from JustCarmen/wt-lang

Dutch language file updated.
Mistake in Dutch language file (use consistant terminology)
Merge pull request #263 from JustCarmen/wt-lang

Mistake in Dutch language file (use consistant terminology)