Support for array sorting?

[PaulRBerg]

I know that this is not the main purpose you had in mind for this library, but it seems to me that the name solarray is appropriate for more utility functions than just dynamic array generators.

Would you be open to including a few array sorting functions? If yes, I might be able to create a PR with a few implementations based on the following sources:

• quick sort 1
• quick sort 2
• quick sort 3
• heap sort
• bubble sort
• Sorting in Solidity without comparison