by a bit ugly hack: we specialize some part of the destructor and make
a local copy of these variables so the tests can inspect them later.

it currently does nothing user-visible.

also explicitly reject invalid command ID, which should be internal bug.

mainly for better readability.  no functional change.

on second thought I realized we need to synchronize them because the builder
thread refers to the main thread's class member variables.
shutdown() method is now meaningless so deprecated for now.

we'll use this pattern for other commands.

with fixing Conflicts:

with fixing conflicts in
	ChangeLog
	examples/README

this works around a bit awkward installation setup where there's a link
from "python3" to "python3.x" but not from "python3-config" to the
corresponding "python3.x-config".  That happens for recent versions of
Homebrew.

Sunstudio is unhappy with plain NULL inside EXPECT_EQ and thinks it is
int. This makes it think otherwise.

This should fix compilation issue on sunstudio.

so it sounds more natural as an English term.

this branch introduced is_failed() (and failed() was already defined for
a different a purpose), so for consistency it would be better to name
the running version is_xxx too.

this should fix the main problem of this ticket.

should be pretty trivial, so added a couple of test cases as part of
other tests.

this fixes the test case introduced at the beginning of the branch.

the configurator should be able to delete a component to be removed
even if the it's failing (unexpectedly).  The current implementation
doesn't handle that condition correctly.