MakeLP data format

0: flg:  b7 esc     escape flag
	  b6 lf	     needs autolinefeed
	  b5 ff      do FF at end of page
	  b4 fflf    do LFs at end of page
	  b3 high    VIEW highlight extensions
	  b2 pound1  translate CHR$(96) to '`'
	  b1 pound2  translate CHR$(163) to '`'
	  b0 endff   do a FF (or LFs) at end of text
1: plen: b7-b5: b5-b3 of grafM, 48+(b4-b0 EOR16): page length
2: tlen: b7-b5: b2-b0 of grafM, 48+(b4-b0 EOR16): text length
3: xflg: b7 esc2    escape flag
	  b6 xtr     currently unused
	  b5-b0	     grafP if grafP=0, grafP and grafM invalid
4: typ:  0:	     Type I string information
	  1:	     Type IIa string information
	  2-79:      Type IIb string information
grafM and grafP can only be 64..127


Type I string information:
if esc=1, all strings have CHR$27 prepended; if esc=0, CHR$27 are explicit
for each string {
  offset to string }
for each string {
  if string <> "" { string }
  }
the first string offset is always 0, giving typ=0


Type II string information:
if esc2=0, strings terminated with b7=1;
    if esc=1, all strings have CHR$27 prepended; if esc=0, CHR$27 explicit
if esc2=1, CHR$27s are explicit;
    if esc=0, strings terminated with &00; esc=1, terminator is &FF

Type IIa string table:
for each string {
  if string <> "" { code-63, string }
  }
terminator &FF
the first string is always code 64, for '@', giving typ=1

Type IIb string table:
for each string {
  if string <> "" { code-31, string }
  }
terminator &FF
the first string can be any code from 33 upwards, giving typ>1