add read slicing

added ability to slice arrays on read. This allows indexing into huge HDF5 disk variables and reading part of an array, for 1-D to 7-D.

Added HDF5 library build scripts, for those who need to build HDF5 themselves, under scripts/compile_hdf5.py

add CDash

v2.8.4

ci: use installed stuff

remove duplicated use statements

GFortran 9.3.0 is sensitive to duplicated use statements and will error, so this removes them.

enable fletcher32 checksum if compression used

v2.8.2

comment debug statements, add fletcher32

refactor, streamline

Use more efficient logic, prepare for array slicing, remove unused use elements, put _lt procedures in own file for dev convenience.

auto-chunking

on a per-dataset basis, allow user to either set chunking or auto-chunk for easier use of compression.
Chunking only takes effect when call h5f%initialize(..., comp_lvl=1) where comp_lvl may be from 1 to 9.
Otherwise, data is written contiguously for fastest write speed.
The auto-chunking algorithm was based on h5py, which has a compatible open-source license.

added call h5f%chunks() to get the chunk size of a dataset

Documented verbose and debug options

cleaned up redundant code for cleanliness and speed.

Now works on IBM Power systems as well as Intel / AMD and ARM.

improve fortran 2018 std, accomodate more CPU arches

• improve fortran 2018 compliance
• allow more CPU arches by not using -march=native with GCC

add write_group method, add tests, reduce redundant checks

This also works around an Intel compiler bug for write_group by making an explicit write_group method, which is less confusing for users anyway.

ierr optional, add tests

• ierr optional--will error stop if ierr not present and HDF5 error occurs
• make h5fortran functions not have side effects (no ierr intent(out))
• cleanup build and link
• avoid implicit procedure recursion on write

workaround for Intel Fortran

• ifort has a quirk over the past versions including current where it doesn't realize a function is intrinsic--in this case rank(). it's harmless to explicitly declare this.
• give hint where to find HDF5 for Intel Fortran on Windows