Update layer for selected entities when a layer is selected.
Merge pull request #440 from ajisaacs/master

Update layer for selected entities when a layer is selected.
reverted drawing by layer name order
If an external muparser is not found, fall back to building the bundled one.

Signed-off-by: Tamas TEVESZ <ice@extreme.hu>
Build bundled muparser on Windows

Signed-off-by: Tamas TEVESZ <ice@extreme.hu>
Update notes for FreeBSD; amend Windows notes wrt. muparser.

Signed-off-by: Tamas TEVESZ <ice@extreme.hu>
Include logic to build the bundled muparser on OS X in muparser.pri;
Update README accordingly.

Signed-off-by: Tamas TEVESZ <ice@extreme.hu>