Added lazy initialization for Field.val.

Set default dtype for FieldArray
5 jobs for master in 17 minutes and 34 seconds
Status Job ID Name Coverage
  Test
passed #126384
test_min

00:07:58

passed #126385
test_mpi

00:14:59

passed #126386
test_mpi_fftw

00:15:24

passed #126387
test_mpi_fftw_hdf5

00:16:37

27.0%
 
  Release
passed #126388
release_image_master

00:00:56