use ::System::User().name_safe() instead of ::System::User().name(), since the latter one can throw system exception not handled by RM

1. remove unnecessary std::shared_mutex so_mutex used for backup since its critical sections are fully protected by m_mutex
2. remove unused allResources() methods
3. simplify RM_Impl::hasResources() method
4. simplify getResourceOwners() and getPartitions() implementation using modern c++ style

ATDAQCCRM-87 There are no now lines in journal about free resources when there was no real result of free action

ATDAQCCRM-73 requestResources updated taking into account application and pid. setProcess method added.

ATDAQCCRM-81 Remove obsolete and wrong parameters from IDL done. ATDAQCCRM-78 Deprecated methodsxremoved