[MOD] Package-protected StaticContext#xquery3 flag.
[MOD] Updating the stack-frames code.
[MOD] GFLWOR optimizations.
[ADD] General inlining.
[ADD] Expr#copy() for copying expressions and some static typing.
[MOD] Generalized and simplified the Expr visitor.
[ADD] Function inlining implemented.
[DEL] Expr#remove(Var) not needed any longer.
[MOD] cleanup of static variables code.
[MOD] Better strategy for compiling functions and static variables.
[MOD] The stack is now a single array, also some inlining fixes.
Merge branch 'stack-frames' of github.com:BaseXdb/basex into stack-frames
[MOD] All ParseExpr instances are now either abstract or final.
[ADD] Cheapness heuristic for inlining axis paths (allowing index rewritings).
Merge pull request #635 from LeoWoerteler/stack-frames

More index rewritings and some refactoring.
Merge branch 'stack-frames' of github.com:BaseXdb/basex into stack-frames
[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.