Merge branch '6417-quota-unlimited-zero-vs--1' into 'develop'

Unlimited quota is stored as -1, not zero, #6417

Closes #6417

See merge request ispconfig/ispconfig3!1668

Author: Till Brehm

install/sql/incremental/upd_dev_collection.sql

@@ -0,0 +1,2 @@
+
+ALTER TABLE `mail_user` CHANGE `quota` `quota` BIGINT(20) NOT NULL DEFAULT '0';

install/sql/ispconfig3.sql

@@ -1070,7 +1070,7 @@ CREATE TABLE `mail_user` (
   `gid` int(11) NOT NULL default '5000',
   `maildir` varchar(255) NOT NULL default '',
   `maildir_format` varchar(255) NOT NULL default 'maildir',
-  `quota` bigint(20) NOT NULL default '-1',
+  `quota` bigint(20) NOT NULL default '0',
   `cc` text,
   `forward_in_lda` enum('n','y') NOT NULL default 'n',
   `sender_cc` varchar(255) NOT NULL default '',

interface/lib/classes/quota_lib.inc.php

@@ -326,7 +326,7 @@ public function get_databasequota_data($clientid = null, $readable = true) {
 					if($used_ratio >= 0.8) $databases[$i]['display_colour'] = '#fd934f';
 					if($used_ratio >= 1) $databases[$i]['display_colour'] = '#cc0000';
 
-					if($databases[$i]['database_quota'] == 0){
+					if($databases[$i]['database_quota'] == -1) {
 						$databases[$i]['database_quota'] = $app->lng('unlimited_txt');
 					} else {
 						$databases[$i]['database_quota'] = $databases[$i]['database_quota'] . ' MB';

interface/web/dashboard/dashlets/templates/databasequota.htm

@@ -14,7 +14,7 @@
 			  <td>{tmpl_var name='database_name'}</td>
 			  <td>{tmpl_var name='used'}</td>
 			  <td>{tmpl_var name='database_quota'}</td>
-			  {tmpl_if name="quota_raw" op="!=" value="0"}<td>
+			  {tmpl_if name="quota_raw" op="!=" value="-1"}<td>
 			  <div class='progress'>
 				  <div class='progress-bar-striped progress-bar progress-bar-{tmpl_if name="used_percentage" op="<" value="50"}success{tmpl_elseif name="used_percentage" op="<" value="75"}warning{tmpl_else}danger{/tmpl_if}' role='progressbar' aria-valuemin='0' aria-valuemax='100' aria-valuenow='{tmpl_var name="used_percentage"}' style='width: {tmpl_var name="used_percentage"}%'><span>{tmpl_var name="used_percentage"}%</span>
 				  <span class='sr-only'>{tmpl_var name='used'} {tmpl_var name='of_txt'} {tmpl_var name='database_quota'}</span>

interface/web/mail/form/mail_user.tform.php

@@ -166,7 +166,7 @@
 					'regex' => '/^([0-9]{1,})$/',
 					'errmsg'=> 'quota_error_value'),
 			),
-			'default' => '-1',
+			'default' => '0',
 			'value'  => '',
 			'width'  => '30',
 			'maxlength' => '255'