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

- bug in initialization of h5t_tet_ref_elem fixed

- H5_DEBUG_NONE added to documentation of H5SetDebugMask()

- macro H5_DEBUG_NONE added

- memory leak fixed

- some useless tests whether an unsigned int is less than zero removed

- test whether we are using the right hdf5 flavor added:
  parallel if we request parallel otherwise non-parallel

- no need to include 'mpi.h' and 'hdf5.h' here

- the function to define a grid are now available as dummy function in the serial version

- define dummy MPI data-types only if MPI_VERSION is not set.
  According to the MPI specification, this macro must be set after
  including the header MPI header file 'mpi.h'

- bugfix in parallel version

src/h5core/private/h5_init.h:
- remove definition of MPI dummies for serial version
src/h5core/private/h5_types.h:
- define the MPI communicator in 'struct h5_prop_file' only in parallel version
src/h5core/h5_file.c
- adapt to above changes

- do not use GNU extension for pattern rules

- changes to support VTK 8.0
- better check for Fortran compiler

This call creates the directory 'CMakeFiles' which we want to ignore.

- define dummy MPI macros to be used in serial compilation, closing #10
- cleanup some "unused variable" warnings
- fix some format warnings, using C99 format macros

- include stdlib.h added, closing #9

- comments edited

- adapted for serial compilation, closing #8

- set Fortran compiler with AC_PROG_FC, closing #7

- 'ax_pkg_swig.m4' added to 'EXTRADIST'

- set version to 2.0.0rc3

- conditional flushing step data removed, for the time being we flush anyway