Removed fromList & corrected bug in adjustComplete.

Function fromList always hung, so it was removed.

'adjustComplete' had a bug which made function 'update' ignore updates
to index 14 of the stream. To conceptualize the bug, imagine that we
have a 'Complete' made of a 'Bin' and two 'Tip's, and we call
'adjustComplete' with n=1. The result is that a recursive call is made
with n=-1 and the update is ignored.

Also some regular comments for some functions were turned into Haddock
comments.

This pull request solves three outstanding issues opened by me in the previous months.