update installation requirements - php 5.6 and mysql 5.5.3

CHANGELOG

@@ -1,3 +1,12 @@
+Hubzilla 2.6.1 (2017-08-18)
+	- Fix a regression with dav clients
+	- Raise install requirements
+	
+	Plugins/Addon
+	- Diaspora: fix PHP warning
+	- GNU-Social: fix PHP warning 
+
+
 Hubzilla 2.6 (2017-08-16)
 	- Upgrade to bootstrap-4 beta
 	- Consolidate disable_discover_tab config

Zotlabs/Storage/BasicAuth.php

@@ -187,7 +187,7 @@ class BasicAuth extends DAV\Auth\Backend\AbstractBasic {
     }
 
 	protected function check_module_access($channel_id) {
-		if($channel_id && \App::$module === 'cdav') {
+		if($channel_id && in_array(\App::$module,[ 'dav', 'cdav', 'snap'] )) {
 			return true;
 		}
 		$this->module_disabled = true;

boot.php

@@ -49,7 +49,7 @@ require_once('include/hubloc.php');
 require_once('include/attach.php');
 
 define ( 'PLATFORM_NAME',           'hubzilla' );
-define ( 'STD_VERSION',             '2.6' );
+define ( 'STD_VERSION',             '2.6.1' );
 define ( 'ZOT_REVISION',            '1.2' );
 
 define ( 'DB_UPDATE_VERSION',       1193  );

install/INSTALL.txt

@@ -104,7 +104,7 @@ technical abilities.
 	Example config scripts are available for these platforms in the install 
 	directory. Apache and nginx have the most support. 
 
-    - PHP 5.5 or later. 
+    - PHP 5.6 or later. 
 
     - PHP *command line* access with register_argc_argv set to true in the 
     php.ini file - and with no hosting provider restrictions on the use of 
@@ -116,7 +116,7 @@ technical abilities.
 
     - some form of email server or email gateway such that PHP mail() works.
 
-    - Mysql 5.x or MariaDB or postgres database server.
+    - Mysql 5.5.3 or later or MariaDB or postgres database server.
     
     - ability to schedule jobs with cron.