new copyright; att/bsd/shared

Add copyright

make unneeded globals LOCAL (static); move several routines to .c
in which they are called.

changed def of io flags. DLW

changed i66 to separate flags for ccntrl & blzero. DLW

return success/fail on nowreading/nowwriting(). DLW

added 'blank=zero' to f66 init. DLW

added ability to init lu6 with carriage control (init66_). DLW

changed to F_ER codes. DLW

date and time created 81/02/18 18:02:04 by dlw