Changes from 2.9.1 to 2.9.2

Now is possible to register the same plugin (as long as they have the same
ID and name) without errors. This is useful for registering the same
plugin without worrying on whether it has been registered already.
Improved detection of dynamic plugin locations. Now they must implement
plugin_module.print_libpath() as the canonical way to find the path for
the dynamic library plugin.
The blosc2_static has gained the cmake POSITION_INDEPENDENT_CODE property.
This should allow to use the static library in more situations.
BLOSC_STUNE is defined in blosc2.h now. Fixes #481. Thanks to
@DimitriPapadopoulos.
Fixed an issue when having incompressible data in combination with lazy_chunks.
Fix linking with static -DBUILD_STATIC=0. Fixes #480.
Visual Studio 2010 (version 10.0) has been deprecated. Now, users will
need to use Visual Studio 2012 (version 11.0) or later.
Many small fixes and code improvements. Thanks to @DimitriPapadopoulos,
@bnavigator.

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