Just counting lines is simpler and more portable. It takes about 1ms to
count 10,000 lines in a 12,000 line program versus about 20us using
pages. But we can afford 1ms ;)
blines() never used.
Added bline() to give the line at the point.
blocation() now only gives the offset.
Remove the lines variable.. I never used it.
Do not keep track of the lines in the page. Was more overhead than
it was worth. It was really for VLINES.