Changes from 2.4.1 to 2.4.2

• Fixed BLOSC1_COMPAT mode. If the symbol BLOSC1_COMPAT is defined, one should actually get a correct map for the BLOSC1 API now. Thanks to @MehdiChinoune for pointing this out.

• Optimizations for blosc2_schunk_get_slice_buffer(). Now more caution has been put in avoiding memcpy's as much as possible.

• Now blosc2_set_nthreads() also modifies the schunk compression and decompression defaults.

• Several other fixes, specially when converting schunks to cframe format.