[DaemonManager]: use monerod in user path if available

[pazos]

DaemonManager picks the daemon in the same folder as the wallet-gui, ignoring other possible paths.

diff --git a/src/daemon/DaemonManager.cpp b/src/daemon/DaemonManager.cpp
index 79db8cf..08fe2ae 100644
--- a/src/daemon/DaemonManager.cpp
+++ b/src/daemon/DaemonManager.cpp
@@ -298,15 +298,19 @@ DaemonManager::DaemonManager(QObject *parent)
     : QObject(parent)
 {

-    // Platform depetent path to monerod
-#ifdef Q_OS_WIN
-    m_monerod = QApplication::applicationDirPath() + "/monerod.exe";
-#elif defined(Q_OS_UNIX)
-    m_monerod = QApplication::applicationDirPath() + "/monerod";
-#endif
+    // Try to use monerod from system path if available
+    m_monerod = QStandardPaths::findExecutable("monerod");
+
+    // Fallback to monerod bundled with the application
+    if (m_monerod.length() == 0)
+        m_monerod = QStandardPaths::findExecutable("monerod",
+            (QStringList) QApplication::applicationDirPath());

     if (m_monerod.length() == 0) {
         qCritical() << "no daemon binary defined for current platform";
         m_has_daemon = false;
+    } else {
+        qWarning().noquote() << "Daemon: " + m_monerod;
     }
+
 }

This would allow the daemon to be in a different path than the wallet, but I'm worried about the implications of this change :/

[stoffu]

I tend to be neutral for now. In any case, I think this kind of proposal can also be submitted as a pull request.

[pazos]

done in #1419 with other misc changes in DaemonManager