[WIP] vim-patch:7.4.341

**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

Changes to original patch:
* Use `bool` instead of `int`

This is still WIP as there are several patches regarding sorting which depend on each other.