Add data-md5 attribute to /f/ posts built from JSON.

This makes MD5 Sauce links work for cross-board/thread quotes to /f/.

src/General/Build.Test.coffee

@@ -39,6 +39,8 @@ Build.Test =
       $.rmClass el, 'prettyprinted'
     for el in $$ 'pre[style=""]', root2
       el.removeAttribute 'style'
+    # XXX https://bugzilla.mozilla.org/show_bug.cgi?id=1021289
+    $('.fileInfo[data-md5]', root2)?.removeAttribute 'data-md5'
     textNodes = $.X './/text()', root2
     i = 0
     while (node = textNodes.snapshotItem i++)

src/General/Build/File.html

@@ -1,7 +1,7 @@
 ?{file}{
   <div class="file" id="f${ID}">
   ?{boardID === "f"}{
-    <div class="fileInfo"><span class="fileText" id="fT${ID}">
+    <div class="fileInfo" data-md5="${file.MD5}"><span class="fileText" id="fT${ID}">
       File: 
       <a data-width="${file.width}" data-height="${file.height}" href="${fileURL}" target="_blank">${file.name}</a>
       -(${file.size}, ${file.dimensions}?{file.tag}{, ${file.tag}})

src/classes/Post.coffee

@@ -199,6 +199,7 @@ class Post
       isVideo:    /webm$/i.test link.href
       dimensions: info[0].match(/\d+x\d+/)?[0]
       tag:        info[0].match(/,[^,]*, ([a-z]+)\)/i)?[1]
+      MD5:        fileText.dataset.md5
     size  = +@file.size.match(/[\d.]+/)[0]
     unit  = ['B', 'KB', 'MB', 'GB'].indexOf @file.size.match(/\w+$/)[0]
     size *= 1024 while unit-- > 0