to make
1 return error message should give 30 bytes, first two null

2 .bac files should be relocatable

3 input should clear line position. when in(0)!=out(0)
	basic should answer its own question.
made:
1,2,3
4. new sys calls
5. new error messages fork/program error
6. execute .bac
7 - file
8 ccl note
