Update xml schema
- Added in input/electron_control the element real_space_beta. It is equivalent to real_space = .true. in the namelist input
- Added in algorithmic info a real_space_beta which indicates whether beta projectors are applied in direct space.
- Fixed the real_space_q variable in which now copied in the file the value of tqr internal variable of pw
- Added to output/convergence_info/scf_conv the boolean element convergence_achieved
- Added to ouptut/convergence_info/opt_conv the boolean element convergence_achieved
- The output/convergence_info element has been set as optional in the schema and now in printed only by pw while cp omits printing it.
- Fixed header and cpu_time for CP generated xml file