1. block created from-left-to-right selects only 100%inside selection objects (as it now does)
2.block created from-right-to-left selects all overlapping objects inside selection
From the patch sent by mathieulj (mathieulj), and some fixes and code cleaning.

Requied for constrained Delaunay triangulation (P&S/ratsnest) and zone tesselation (GAL).

   File "rules" has instructional text as comments near top.

2) Convert all text files in repo to LF line ending form.
   Any checkout done with "rules" in play will convert the working
   tree to native line ending, while keeping repo as LF line ending.

Pcbnew: fix bug 1179877, due a bad default  copy constructor, after  my changes about CPOLYGONS_LIST class.
More about CPOLYGONS_LIST work.

Pcbnew: fix minor bug about  plot line width.

This is a starting point of some code enhancements relative to polygons in Pcbew and 3D viewer.

- Removed spurious int casts (these are truncated anyway and will break
  doubles)

- Applied the Distance, GetLineLength, EuclideanNorm, DEG2RAD, RAD2DEG
  ArcTangente and NORMALIZE* functions where possible

- ArcTangente now returns double and handles the 0,0 case like atan2, so
  it's no longer necessary to check for it before calling

- Small functions in trigo moved as inline

the spurious warning about stuff that couldn't be seen when changing
colours.
NOTE that the 'net name' layer is present and configurable but non used 
anywhere!

Minor changes in dialogs to ensure a better likeness between dialogs on Linux and Windows (mainly, remove some wxStaticBoxSizer in dialogs)

Implemented the LAYER_NUM typedef (LAYER was already taken as a class name...) to represent a layer number.

- Renamed ReturnMaskLayer to GetLayerMask (since it's a plain getter)

Pcbnew: Export vrml: fix an issue for 3D shapes having a local offset defined: the local offset was not correctly scaled.

Pcbnew: fix a very old bug in DRC, pad to pad drc tests: sometimes a test between a rectangular pad and an oval pad was skipped.
Segment Hit Test: enhanced detection near segment ends (noticeable for instance when clicking on short tracks in Pcbnew.
Remove duplicate code about segment hit test.
remove unused file.

Polyline.cpp: fix a bad wxASSERT test which generate error messages in Debug mode when there is no error, in DEBUG mode, when filling zones with holes.

switch all <math.h> includes to <cmath> includes on an attempt to dodge some abiguous references to atan2()

Pcbnew: code cleaning in polygons

Remove arcs support in zone outlines: this is a legacy code from FreePCB, never used, never tested, never maintained.

Some coding style policy fix.

This is *a work in progress*, so some features are missing, and/or could be modified.
Mainly keepout zones are not yet exported to autorouters, and pads are not taken in account.
Some code cleanup in polygon.*