Display the uptime in a more readable way

This adds CString::ToTimeStr() which converts a number of seconds into
a human readable time string.


git-svn-id: https://znc.svn.sourceforge.net/svnroot/znc/trunk@1107 726aef4b-f618-498e-8847-2d620e286838

znc.cpp

@@ -96,7 +96,7 @@ CString CZNC::GetTag(bool bIncludeVersion) {
 
 CString CZNC::GetUptime() {
 	time_t now = time(NULL);
-	return CString(now - TimeStarted()) + " seconds";
+	return CString::ToTimeStr(now - TimeStarted());
 }
 
 bool CZNC::OnBoot() {