Merge with feature

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branch : develop
Rules for creation version.

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branch : develop
Don't open new window if user canceled opening file.

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branch : develop
If not get all list of details user will not show all details for creation a
layout. For this change mode from Draw to Details and than prepare details.

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branch : develop
Fixed issue #198.

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branch : develop
Static library for export a layout to Wavefront OBJ file.

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branch : develop
New better way select objects for creation a detail.

Now the detail cutting points and use only cutted part for creation paths.

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branch : feature
By default seam allowence for the detail is 1 pattern's units.

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branch : feature
Preparation for new changes in pattern format.

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branch : feature
Fixed disappearing curve in detail if path counterclockwise.

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branch : feature
Cutting too long an acute angle.

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branch : feature
All points in detail should go clockwise. This mean in some cases need reverse
curves that go anticlockwise. Old method reversing curves doesn't work
correct in all cases. I don't see now way automatically handle this. That's
why now user can choose himself need reverse points for this curve or not.

Also this mean increment in format version to 0.1.2.

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branch : feature
Application crash.

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branch : feature
Merge with feature

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branch : develop