Fix bugs in ArMem and make disk loading and storing nicer

source/RobotAPI/libraries/armem/core/longtermmemory/Memory.cpp

@@ -78,7 +78,7 @@ namespace armarx::armem::ltm
 
     void Memory::defineProperties(armarx::PropertyDefinitionsPtr defs, const std::string& prefix)
     {
-        defs->optional(dbsettings.host, prefix + ".ltm.10_host");
+        defs->optional(dbsettings.host, prefix + "ltm.10_host");
         defs->optional(dbsettings.port, prefix + "ltm.11_port");
         defs->optional(dbsettings.user, prefix + "ltm.20_user");
         defs->optional(dbsettings.password, prefix + "ltm.21_password");