Fix a 0-byte read condition while reading request bodies. We need to

Fix a 0-byte read condition while reading request bodies. We need to
stop reading when the buffer is full, and continue again when data
have been used. Thanks to Vladimir B. Savkin for finding this issue.

Also some cleanups in httpRequestFree()
* Permanently removed some old suspicious code Duane had found and commented out.
* Added a new comment at the same place, asking on the validity of the few next
  lines. Looks like we are looking a bit too deap into the store entry
  there..