comment and formatting fixes
rename LOWDATA segment to LOWBSS
Merge pull request #54 from groessler/something_to_pull

some cleanups for 'atarixl'
Merge remote-tracking branch 'upstream/master'
Rename 'syschk' symbol in the linker config file, which forces inclusion
of the 'system check' load chunki, to '__SYSTEM_CHECK__'.
atari-asm.cfg linker config file