****************************************************************************
* - block_ChainAppend : append a block to the last block of a chain. Try to
* avoid using with a lot of data as it's really slow, prefer
- * block_ChainLastAppend
+ * block_ChainLastAppend, p_block can be NULL
* - block_ChainLastAppend : use a pointer over a pointer to the next blocks,
* and update it.
* - block_ChainRelease : release a chain of block