Tidying up
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Comments and an unused define removed from last
commit.

Turned back on restricted deselect
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Fixed restricted deselect for edge select. Not
sure if face deselect is working properly, will
follow up with any reports on the tracker.

Return of Screw tool:
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Screw tool brought back. Based on a patch submitted
by howardt in IRC.

Return of Spin tool:
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Spin tool brought back by patch submitted
by howardt in IRC

Extrude Bug Fixes:
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Two extrude bug fixes provided by howardt in IRC

1: Edges getting extruded in sheets did not have
consistent normals.

2: Sometimes faces created by the extrusion
process were corrupt

Turned select vertex path back on and added
back in selection history for bmesh->mesh
and mesh->bmesh conversions:
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Select Vertex Path had wrong invoke callback
(shouldn't have any?).

Also selection history was not converted when
doing bmesh->mesh or mesh->bmesh conversions.
This meant that tabbing in and out of editmode
would make your selection history dissapear.
Undo pop would also not preserve selection
history so any operators that relied on it
would not work when you adjusted their settings.

Brought back select by number of vertices
and select loose verts/edges:
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Split select by number of vertices and select
loose verts/edges into seperate functions.

Previously select by number of vertices was
also accessed through two different UI items,
"Select Quads" and "Select Triangles". Now
it is one function with a integer property
for selecting the size of the face you want
selected.

Also added an option to modify the behavior
of the selection. Can now select whether you
want to select faces that have vertices
equal to, less than or greater than the number
of vertices in operator property.

Brought back loop multiselect:
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Loop multiselect operator brought back. It can
be accessed via the select->edge loop and
select->edge ring menu entries or through the
ctrl-e edge specials menu.

Bringing back statistics draw options:
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Based on a patch from howardt, this commit brings
back drawing:

-Edge length
-Face edge angles

and

-Face area

for the 3d view.

Fix for a crash:
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Another fix from howardt in IRC.