[RDY] vim-patch:7.4.341, 7.4.347, 7.4.351, 7.4.358

**vim-patch:7.4.341**

Problem:    sort() doesn't handle numbers well.
Solution:   Add an argument to specify sorting on numbers. (Christian Brabandt)

https://code.google.com/p/vim/source/detail?r=adc4a84f72eb44dae657af713922a6e2c1f64ae3

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**vim-patch:7.4.347**

Problem:    test55 fails on some systems.
Solution:   Remove the elements that all result in zero and can end up in an arbitrary position.

https://code.google.com/p/vim/source/detail?r=v7-4-347

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**vim-patch:7.4.351**

Problem:    sort() is not stable.
Solution:   When the items are identical, compare the pointers.

https://code.google.com/p/vim/source/detail?r=v7-4-351

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**vim-patch:7.4.358**

Problem:    Sort is not always stable.
Solution:   Add an index instead of relying on the pointer to remain the same. Idea by Jun Takimoto.

https://code.google.com/p/vim/source/detail?r=v7-4-358

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Changes to original patches:
* Use `bool` instead of `int`