added saving of layout as .ps and .eps file

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branch : develop
refactoring if-else, busy cursor while waiting for pdftops, error msg box added

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branch : develop
Brought common part to a separate method.

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branch : develop
Code style change.

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branch : develop
Fixed issue #18.

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branch : develop
Fixed issue #17.

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branch : develop
New dependence - xpdf.

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branch : develop