Major fix for subs > ZLIB_CHUNK

  Without this patch and with subs > ZLIB_CHUNK, subberthehut enters
  an endless loop, writes corrupted data, and keeps appending to z_out
  filling the disk and possibly freezing the system.

Signed-off-by: Mohammad Alsaleh <msal@tormail.org>
Add --name-search-only option

  Search by hash returns a false-positive 1st result sometimes. Using
  this new option is useful in those situations.

Signed-off-by: Mohammad Alsaleh <msal@tormail.org>
totally nitpicky style changes