[Nix-dev] development/libraries too large

[Michael Raskin]

>>> Probably we should drop the tree structure (reduce the number of
>>> categories?) and replace it by search tags + tools to query these tags.
>>
>> +1
>
>+1
>
>In addition, I'd say the actual Nix packages tree structure should be
>redesigned to
>be developer-oriented. I.e., less rather than more categories, and
>subdirectories
>make sense for packages that are maintained as a unit or have a
>similar build structure.

Maybe logic of the package tree should be revised, but having 2735 
subdirectories in a single directory doesn't sound too friendly, either.

Although maybe splitting on the first-letters basis is enough as we have
all-packages.nix anyway.