[firedrake] New firedrake dependency: h5py

[Lawrence Mitchell]

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Dear all,

recently, support for checkpoint objects was added to firedrake.
These checkpoints are written using HDF5.  To support this, firedrake
has acquired some additional dependencies:

1) PETSc must be built with support for HDF5.

2) h5py must be installed and be linked against the *same* version of
the HDF5 library as used when building PETSc.  Some instructions for
this are linked from http://firedrakeproject.org/download.html#h5py.

The firedrake-install script has been updated to automate this
process, if you use it.

To update an existing installation, you will have to rebuild the
update script, following the instructions here:

http://firedrakeproject.org/download.html#recovering-from-a-broken-insta
llation-script

and then run firedrake-update passing the additional flag --rebuild
(to force a rebuild of PETSc).

I hope that I've managed to make this all work properly, but please do
report any issues.

Cheers,

Lawrence
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