clean docs

docs/lib2x-polytransversals.md

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-# polytransversals
-
-Crosscutting a polyline at different points gets several transversals. This module can operate reversely. It uses transversals to construct a polyline. For example, imagine that you have the following transversals:
-
-![polytransversals](images/lib2x-polytransversals-1.JPG)
-
-This module can use them to construct the polyline:
-
-![polytransversals](images/lib2x-polytransversals-2.JPG)
-
-When using this module, you should use points to represent each transversal. 
-
-You can view it as a better polyline2d module. If you have only the points of a path, using `polyline2d` or `hull_polyline2d` is a simple solution. If you know the transversals along a path, you can use `polytransversals` to get a better polyline.
-
-## Parameters
-
-- `transversals` : A list of transversals. Each transversal is represented by a list of points. See the example below.
-
-## Examples
-
-	use <rotate_p.scad>;
-	use <polytransversals.scad>;
-	use <hull_polyline2d.scad>;
-	
-	r = 35;    
-	tran_pts = [[-5, 0], [0, 5], [5, 0]];
-	
-	trans = [
-	    for(a = [0:10:120])
-	        [
-	            for(p = tran_pts) 
-	                rotate_p(p, [0, 0, a]) + [r * cos(a), r * sin(a)]
-	        ]
-	];
-	
-	polytransversals(trans);
-	
-	#for(tran = trans) {
-	    hull_polyline2d(tran, 0.5);
-	}
-
-![polytransversals](images/lib2x-polytransversals-3.JPG)

docs/lib2x-shape_glued2circles.md

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-# shape_glued2circles
-
-Returns shape points of two glued circles. They can be used with xxx_extrude modules of dotSCAD. The shape points can be also used with the built-in polygon module. 
-
-## Parameters
-
-- `radius` : The radius of two circles.
-- `centre_dist` : The distance between centres of two circles.
-- `tangent_angle` : The angle of a tangent line. It defaults to 30 degrees. See examples below.
-- `t_step` : It defaults to 0.1. See [bezier_curve](https://openhome.cc/eGossip/OpenSCAD/lib2x-bezier_curve.html) for details.
-- `$fa`, `$fs`, `$fn` : Check [the circle module](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Using_the_2D_Subsystem#circle) for more details.
-
-## Examples
-
-    use <shape_glued2circles.scad>;
-
-    $fn = 36;
-
-    radius = 10;
-    centre_dist = 30;
-
-    shape_pts = shape_glued2circles(radius, centre_dist);
-    polygon(shape_pts); 
-
-![shape_glued2circles](images/lib2x-shape_glued2circles-1.JPG)
-
-    use <shape_glued2circles.scad>;
-
-    $fn = 36;
-
-    radius = 10;
-    centre_dist = 30;
-
-    shape_pts = shape_glued2circles(radius, centre_dist);
-    width = centre_dist / 2 + radius;
-
-    rotate_extrude() difference() {    
-        polygon(shape_pts);    
-
-        translate([-width, -radius]) 
-            square([width, radius * 2]);
-    }
-
-![shape_glued2circles](images/lib2x-shape_glued2circles-2.JPG)
-
-    use <shape_glued2circles.scad>;
-
-    $fn = 36;
-
-    radius = 10;
-    centre_dist = 30;
-
-    shape_pts = shape_glued2circles(radius, centre_dist);
-
-    width = centre_dist + radius * 2;
-
-    rotate_extrude() 
-        intersection() { 
-            rotate(-90) polygon(shape_pts);    
-
-            translate([radius / 2, 0]) 
-                square([radius, width], center = true);
-        }
-
-![shape_glued2circles](images/lib2x-shape_glued2circles-3.JPG)