Show rechecking progress

When having big torrents, the rechecking might take a while to
complete. Users need some sort of feedback that progress is being made.
Also, I changed the float to qreal since that's the return type.

src/base/bittorrent/torrenthandle.cpp

@@ -519,15 +519,19 @@ int TorrentHandle::piecesHave() const
 
 qreal TorrentHandle::progress() const
 {
+    if (!isChecking()) {
         if (!m_nativeStatus.total_wanted)
             return 0.;
 
         if (m_nativeStatus.total_wanted_done == m_nativeStatus.total_wanted)
             return 1.;
 
-    float progress = static_cast<float>(m_nativeStatus.total_wanted_done) / m_nativeStatus.total_wanted;
+        qreal progress = static_cast<qreal>(m_nativeStatus.total_wanted_done) / m_nativeStatus.total_wanted;
         Q_ASSERT((progress >= 0.f) && (progress <= 1.f));
         return progress;
+    }
+
+    return m_nativeStatus.progress;
 }
 
 QString TorrentHandle::category() const

src/webui/api/synccontroller.cpp

@@ -327,7 +327,7 @@ namespace
 // Each value of the 'torrents' dictionary contains map. The map can contain following keys:
 //  - "name": Torrent name
 //  - "size": Torrent size
-//  - "progress: Torrent progress
+//  - "progress": Torrent progress
 //  - "dlspeed": Torrent download speed
 //  - "upspeed": Torrent upload speed
 //  - "priority": Torrent priority (-1 if queuing is disabled)

src/webui/api/torrentscontroller.cpp

@@ -132,7 +132,7 @@ namespace
 //   - "hash": Torrent hash
 //   - "name": Torrent name
 //   - "size": Torrent size
-//   - "progress: Torrent progress
+//   - "progress": Torrent progress
 //   - "dlspeed": Torrent download speed
 //   - "upspeed": Torrent upload speed
 //   - "priority": Torrent priority (-1 if queuing is disabled)