update the header definition according to PLATO-UVIE-PL-UM-0001 Draft 6

Changed version_id from 16 to 32 bit in the generic header. Add spare bits to the adaptive imagette header and the non-imagette header, so that the compressed data start address is 4 byte-aligned.

Closed #2 (closed)

CHANGELOG.md

@@ -16,6 +16,7 @@ E.g. "# comment\n ABCD 1    2\n34B 12\n" are interpreted as {0xAB, 0xCD,
 ### Changed
 - update the header definition according to PLATO-UVIE-PL-UM-0001 Draft 6
     - changed version_id from 16 to 32 bit in the generic header. Add spare bits to the adaptive imagette header and the non-imagette header, so that the compressed data start address is 4 byte-aligned.
+- Rename cmp_tool_lib.c to cmp_io.c
 
 ## [0.07] - 13-12-2021
 - **NOTE:**  The behaviour of the cmp_tool has changed. From now on, the compressed data will be preceded by a header by default. The old behaviour can be achieved with the `--no_header` option.