This reverts commit d47295f5.

This reverts commit 3964dea2.

This reverts commit 0fdcd2a4.

Conflicts:
	abstractions/Makefile

This reverts commit 86dae341.

make [declare -lib] handle absolute paths (and namespace-prefixed paths) consistent with object boxes

* the original namespace-collision checker only worked for abstractions
* trying a new namespace-collision checker revealed about 80 new clashes.
  Since there are so many it's probably too disruptive to remove them.
* probably need to revert the namespace clash abstraction removals

I don't see any use of the namespace prefix in the repo (like
la-kitchen/amplitude_n). So while this has the potential to break
some patches in the wild, it appears most people have been using
either unprefixed names or the more popular mapping library prefix.

If this ends up breaking a bunch of stuff we can always revert it.