- derivative fix floating point rounding errors for certain sizes

- increase derivative size for which metadata is kept
- imagick use 4:2:2 chroma subsampling (reduce file size by 20-30% with "almost" no human perception)
- dont show mobile theme links if there is no mobile theme installed
- mobile theme favicon removed because 404

git-svn-id: http://piwigo.org/svn/trunk@13426 68402e56-0260-453c-a942-63ccdbb3a9ee

themes/smartpocket/template/header.tpl

@@ -22,7 +22,6 @@
 {if (isset($REVERSE) and $REVERSE and $PAGE_TITLE == l10n('Home'))}
 <title>{$GALLERY_TITLE} | {$PAGE_TITLE}</title>{else}
 <title>{$PAGE_TITLE} | {$GALLERY_TITLE}</title>{/if}
-<link rel="shortcut icon" type="image/x-icon" href="{$ROOT_URL}{$themeconf.icon_dir}/favicon.ico">
 <link rel="start" title="{'Home'|@translate}" href="{$U_HOME}" >
 
 {get_combined_css}