Bump version

Python, documentation: bump version

README: add a line break for better readability

Debian: update changelog

Python: search for other names of libpython.so

Some distros provide a libpython3.so symlink that points to the actual
libpython${major}.${minor}.so file. Other distros, such as Ubuntu, do
not. To prevent dlopen() from failing, we now attempt to load both
libpython3.so and libpython3.${minor}. This fixes the problem of
HDF5-UDF not finding symbols from libpython when loading the cffi
module.

Fallback to /proc/self/exe if realpath(argv[0]) fails

We use realpath() to identify the directory where the hdf5-udf file
was installed so we can tell where the UDF template files were put.
If the program name does not contain any elements to be resolved,
then realpath() does not do anything, though -- and we can't tell
where the template files are.

This commit uses /proc/self/exe as a fallback in case realpath on
argv[0] does not return the information we need.