Fix GL journal save, edit, detail view and list filters

Send journal lines, gl_id and list filters inside the ajax data payload where ajax_request reads them, select period when replacing a manual journal, and show ledger amounts to two decimals.

app/journal/new.php

@@ -216,11 +216,17 @@
       autoPrepare: true,
       checkRequired: 0,
       action: 'manage',
-      gl_id:        document.getElementById('gl_id').value || 0,
-      journal_date: jdate,
-      reference:    document.getElementById('reference').value,
-      description:  document.getElementById('description').value,
-      lines:        JSON.stringify(lines),
+      // Payload fields must go inside `data` — ajax_request() ignores unknown
+      // top-level options. As siblings of `url`, `lines` was never sent (it is
+      // not a form field, so autoPrepare could not pick it up either) and every
+      // save was refused with "At least two journal lines are required."
+      data: {
+        gl_id:        document.getElementById('gl_id').value || 0,
+        journal_date: jdate,
+        reference:    document.getElementById('reference').value,
+        description:  document.getElementById('description').value,
+        lines:        JSON.stringify(lines)
+      },
       onSuccess: function() {
         window.location.href = server_url + 'journal/index.php';
       }
@@ -238,7 +244,7 @@
       autoPrepare: true,
       checkRequired: 0,
       action: 'read',
-      gl_id: <?php echo (int)$_GET['gl_id']; ?>,
+      data: { gl_id: <?php echo (int)($_GET['gl_id'] ?? 0); ?> },
       onSuccess: function(res) {
         var d = res.output;
         var h = d.header;