CHAIN MERGE with DELETE clause: only 2 commas before DELETE, pen ended ranges not allowed.
added test for CHAIN DELETE
removed FIXME line on CHAIN DELETE (nothing to fix)
rebuild memory model after CHAIN
Tandy erase level must be in 0,1,2; rewrote CLEAR TODOs to be clearer
fixed disappearing 80-column list lines
fixed disappearing lines before double list lines on scroll
clear list lines also if there are LFs
empty line but no wrap on println up to and including col 80.
added 80-column printline test
improvements to clear line for list with LF which still didn't work properly
Quit after error if -q is given
removed FIXME (nothing to fix)
removed TODO - not important
fixed crash on redefining FIELD variables
fixed incorrect program memory size; improved TODO
str_ptr should be a number in var_memory, not a StringPtr
fixed malfunctioning FNx variables due to changed reference semantics
WIDTH should accept number_rows argument as long as it's 25. Updated HELP for WIDTH
corrected EGA palette entry 12