[MOD] Simplified OrderBy expression.
Revert "Extended BitArray"

This reverts commit ed531a36e952d907bd8578529289170b7d882431.

Conflicts:
	src/main/java/org/basex/util/BitArray.java
	src/test/java/org/basex/test/util/BitArrayTest.java
[MOD] Enabled inlining across order-by clauses.
[MOD] Fixed bugs found by XQUTS and XQFTTS.