* Scipy 1.14.0 removed deprecated scipy.integrate.trapz and
scipy.integrate.simps functions
* numexpr introduced (in version 2.9?) sanity check rules, which result
in invalid control character errors if ignored.
* numpy 2.0 changed __array_ufunc__ such that axis=None is possible.
* numpy 2.0 has removed np.asfarray

python 3.9 on github has trouble installing numexpr.

it has been removed in numpy 2.0

otherwise numexpr raises an error "expression xxx has forbidden control characters"

in the kwargs, the argument axis=None may be give when reducing all
axis. Handle this case.

upate the code accordingly

various smilei reader bugfixes

small fixes

last merge should have merged into master instead of dev

The smileih5.py file was tested with latest SmileiPIC (v5.0) & Happi version. The test data were dumped from Smilei version v5.0 and the the output values are compared with latest corresponding version of Happi. The relative error of the mode expansion was in the order of 10^-15 comparing happi's output with postpic's output from this commit.

The doc-stings were added and the code is tested using run-tests.py

add full periodic table and remove deprecation warnings

* includes a manual squeeze of the first dimension as np.squeeze changed its behavior (2f44aeb7).
* adjustment to change of behavior in numexpr (2d20484a).