Add support for hdf5 int8 types (int8, uint8)

See merge request !7

Resolve "hdf5 1.12 and newer support"

Closes #21

See merge request !6

Resolve "unknown macro AC_MSG_ERROR"

Closes #20

See merge request !5

Resolve "release 2.0.0rc6"

Closes #19

See merge request !4

Resolve "memory leaks in H5Part"

Closes #18

See merge request !3

Resolve "in configure.ac: exit after AC_MSG_ERROR is not required"

Closes #17

See merge request !2

Resolve "move dissolving ghost-zones into dedicated function"

Closes #15

See merge request !1

- new API function H5Block3dSetViewDissolveGhostZones() added

Since MPI-POSIX VFD has been removed from hdf5 > 1.8.12, but a test
with stride data should be performed, we use independent IO instead for
hdf5 > 1.8.12

In h5_set_view() u->shape was created two times.

- include of "mpi.h" removed. There is no need for it and this breaks the serial case

- h5u_get_totalnum_particles_by_idx():
  - comment added
  - definition of 'total' and 'dmax' moved

- set DEBUGMASK to all

src/include/h5core/h5_log.h: missing backslashes in definition of macro 'H5_API_ENTER()' if NDEBUG is set fixed

- H5PartSetNumPoints() renamed to H5PartSetNumItems()
- H5PartGetNumPoints() renamed to H5PartGetNumItems()
- Dataset names longer then 64 bytes are handled as error.
- Same for step/iteration names.
* core API
- we use the term 'iteration' instead of 'step'
- we use the term 'item' instead of 'point'
- re-factor function and variable names
- in printing messages/debug output fixed
- do not flush (sync to disk) after writing a dataset by default,
  can be controlled by a property

- set version to 2.0.0rc5

- print message if Python is disabled

- warning in 'h5b_3d_set_grid()' if compiled serial fixed

- refactor 'h5_initialize()' and 'h5_finalize()'

- adapt to moved h5_init

- moved from 'private'

- in definition of 'struct h5_dta_types': define type for parallel H5Grid only if enabled

- call to H5Finalize() added

- call to H5SetDebugMask() added

- warning in initialization of 'h5_rfmts' fixed