various documentation updates:

INSTALL.TXT:
- added a note to read the official PostfixAdmin documentation first,
  and that "external" HOWTOs on the web are often outdated or incomplete.
  That might sound selfish, but would already have saved several users
  some time.
- updated some links
- added link to the wiki
- added hint about config.local.php
- added note about write access for templates_c directory for www-data

UPGRADE.txt
- added note about setup.php?debug=1
- added note about postfix config update (alias domains)
- added note about templates_c permissions


git-svn-id: https://svn.code.sf.net/p/postfixadmin/code/trunk@937 a1433add-5e2c-0410-b055-b7f2511e0802

DOCUMENTS/UPGRADE.txt

@@ -57,6 +57,13 @@ to have change the permissions for Postfix Admin.
 
 (the last command assumes your Apache is running with group "www")
 
+Since version 2.4 we use smarty templates. That means the templates_c directory
+needs to be writeable for your webserver.
+
+  $ chown -R www-data templates_c/
+
+(if your Apache runs as user "www-data")
+
 
 4. Configure
 ------------
@@ -66,8 +73,8 @@ relevant to your setup.
 Comparing config.inc.php with your previous using "diff" might save you some
 time.
 
-You can use a config.local.php file to contain your local settings - these will override any 
-defined in config.inc.php
+You can use a config.local.php file to contain your local settings. These will override any 
+defined in config.inc.php - and save some time when upgrading to a new version of PostfixAdmin ;-)
 
 5. Run setup.php
 ----------------------------------------
@@ -75,6 +82,7 @@ defined in config.inc.php
 Access setup.php through a web browser.
 
 It will attempt to upgrade your database, and also allow you to create a superadmin user.
+(In case the database upgrade fails, you can run setup.php?debug=1 to see the last executed query.)
 
 From version 2.3, you need to specify a setup_password in config.inc.php - 
 setup.php should guide you through this process. If you do not have a setup_password, type one
@@ -89,6 +97,12 @@ If you update from 2.1 or older, also create a superadmin account using setup.ph
 Note that admin/ has been merged into the main directory. Login with the
 superadmin account to setup domains and domain admins.
 
+5. Upgrade your postfix config
+------------------------------
+
+Since version 2.3, PostfixAdmin supports alias domains ($CONF['alias_domain']).
+If you want to use them, you have to add some queries to your postfix config -
+see POSTFIX_CONF for details.
 
 
 6. Done