Note that any module that depends on StreamDevice will load it first using `handleDependencies` which
is called before we add the _DB paths. So if a module depends on StreamDevice, this will be accurately
caught; moreover, if StreamDevice is not loaded, then we don't bother setting this path.

require didn't allow to load a test version without specifying it.
With conda, as there is always only one version in the environment,
the version found should always be loaded (even if test version).

JIRA ICSHWI-4144 #action In Progress

This reverts commit 14476605.

save and restore MODULE and MODULE_DIR after running a script, because that script may have called require

b3bc2ac2