move buffer initialization to buffer_create

Description

Move the buffer initialization to the create_buffer routines. The initialization to zero is controlled by an optional argument.

News snippet

Move the buffer initialization to the create_buffer routines.

Checklist

• I have checked that my code follows the Octopus coding standards
• I have added tests for all the new features added in this request.

src/basic/accel.F90

@@ -724,7 +724,7 @@ contains
     call parse_variable(namespace, 'AllowCPUonly', default, accel%allow_CPU_only)
 
 
-    !%Variable ZeroGPUBuffers
+    !%Variable InitializeGPUBuffers
     !%Type logical
     !%Section Execution::Accel
     !%Description