Doc: Include hdf5 functions in Python API doc

* requires libhdf5 on RTD
* exclude developer info from API doc

.readthedocs.yml

@@ -21,6 +21,7 @@ build:
   os: "ubuntu-22.04"
   apt_packages:
     - libatlas-base-dev
+    - libhdf5-serial-dev
     - swig
   tools:
     python: "3.11"

include/amici/solver.h

@@ -39,7 +39,8 @@ namespace amici {
  * variables and status flags) are specified as mutable and not included in
  * serialization or equality checks. No solver setting parameter should be
  * marked mutable.
- *
+ */
+/*
  * NOTE: Any changes in data members here must be propagated to copy ctor,
  * equality operator, serialization functions in serialization.h, and
  * amici::hdf5::(read/write)SolverSettings(From/To)HDF5 in hdf5.cpp.