source library naming doesn't make much sense

[sinewalker]

The numbers in the source/ directory dictate loading order, which is okay. But I've grouped them wrong. They should be ordered not only by when they get sourced, but also by loose functional element.

So a new grouping:

00: dotfiles itself
10: unassigned
20: shell environment controlls
30: tools and utilities
40: operating systems
50: development environments
60: unassigned
70: unassigned
80: host-specific
90: applications
99: loaded last: clean-up of the rest (e.g. shell path goes here)

Within the groups I can still order things by using the 2nd digit, if it's required.