[new B+ tree] Added close and markDirty() calls where necessary.
[new B+ tree] Added markDirty() to NonUniquePagedBTree search method.
[new B+ tree] Fixed wrongly removed lines.
Merge remote-tracking branch 'origin/unique-non-unique-trees' into unique-non-unique-trees

Conflicts:
	src/org/zoodb/internal/server/index/btree/unique/UniqueBTreeUtils.java
	tst/org/zoodb/test/index2/btree/TestBTree.java
[new B+ tree] Fixed merge error.