Carries all twelve tools, with Cache Commander at 1.2.1 and the other eleven

unchanged at 1.2.0.

Cache Commander's move to another folder is now safe for whatever is already in

that folder. The folder you pick is usually an external drive with other work on

it, and the move wrote straight to the destination filename without asking

whether it was free: a cache from another project, or an Alembic file of the

same name, was overwritten without a word, and a failure partway through could

then delete that file as well. A destination name is now taken only when the

filesystem says it is free, a collision is stored under the next free name and

reported, copies are verified beside the destination and put into place in one

move, the clean-up after a failure removes only files the operation created, and

a cache that could not be repointed keeps the settings it had.

The same testing found that moving a cache a second time read the frame number

from the wrong end of the filename, so any cache whose name contained an

underscore was written under a name Blender does not look for and stopped

playing. That is fixed and covered by a test that moves twice and compares the

frame vertex for vertex.