dm_send linux converter done.
dm_send generate linux/adacl-serial_communications.ads and linux/adacl-serial_communications.adb
Merge remote-tracking branch 'refs/remotes/origin/feature/dm_send' into feature/dm_send
dm_send prepare merge
dm_send prepare merge
dm_send update pre-build
release 8.1.0 update GNUmakefile
release adacl-8.1.0 skip the unit tests and proves.