Remove evc_d
Remove evc_d, using_evc, using_evc_d, and replace the code with OpenACC counterpart.
PINNED attribute of evc has been removed, and pinning is now done with cudaHostRegister/cudaHostUnregisterCUDA API.
Module wavefunctions_gpum (Modules/wavefunctions_gpu.f90) has been removed.
Test suite passed on CPU and GPU for pw, ph, cp, tddfpt, hp.
Edited by Ivan Carnimeo