paket add should sort packages by name

[dnauck]

Like issue #187 paket add should sort dependencies while adding (maybe with an additional flag/option)

[cdrnet]

Since this file is often maintained by hand I don't think that should be default behavior (at least not reordering existing entries).

[forki]

I think we could try to preserve alphabetical order. Paket add could try to assume alphabetical order and add whereever it fits best. we should probably not reorder the whole file.

[agross]

we should probably not reorder the whole file.

Definitely!

[dnauck]

+1 for @forki 's suggestion