Doesn't recognize TS2068 DELETE keyword

[ryangray]

The DELETE keyword in TS2068 BASIC isn't recognized. This was probably easy to miss as its code is 12, rather a long way from 123. The fix is sort of easy. The first thing is to insert 110 empty token entries after "onerr", then add the entry "delete","", before the NULL:

 198:     "onerr", "",
 199:     "", "",
 200:     "", "",
 ...
 308:     "", "",
 309:     "delete", "",
 310:     NULL

The other change is to line 934 to change the min token number from 123 to 12:

934: && toknum >= 123) {
becomes:
1045: && toknum >= 12) {

Although, I would have thought the for loop condition of *tarrptr != NULL would make this check unnecessary anyway.