fixed append to BATs with "BOUND2BTRUE" tails: append might destroy sorting, hence, BUNfnd lookups must not use binary search, thus, we unset the sorted bit, before we start appending, not afterwards.
fixed append to BATs with "BOUND2BTRUE" tails:
append might destroy sorting,
hence, BUNfnd lookups must not use binary search,
thus, we unset the sorted bit, before we start appending, not afterwards.

(this fixes most of the current pathfinder BATpropcheck errors)

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb