raco pkg: expose, record, etc., module and dependency information

A package catalog now supplies information about a package's modules
and dependencies, so propagate it when copying a catalog, make the
information accessible via `raco pkg catalog-show', and so on.
Synch German string constants with latest.
Remove some redundant "www."s.
Filename cleanup

Avoid spaces and parens, adjust code, change the r-logo name.
Improvify comment text.
Tiny typo.
Some style fixes.
Fix a bug in base conversion.

This is a simple fix, and the bug is bad enough that it might be worth
it to include in the release.
Switch from "x" to "*".

As previously discussed with Ryan.
typos
minor code improvement
switch DrRacket's "Install Package..." to the new package manager GUI
adjust the new "notation" section of the reference
add some comments to help explain the compiler's space-safety pass
minor field contract clarifications
Fix Reference typos
Adding some debugging notes
Use a single evt for the whole connection
Don't always dump memory
Making github API keys part of the remote-package-checksum API so that the official catalog won't be blocked during routine updates