Allow bulk operations for confman create, rmmod, and recipe delete

[blee]

create, rmmod, and recipe delete should be improved to allow bulk operations, e.g.:

confman create module [module ...]

[blee]

(In [451]) Implement bulk operations for confman create.

See #72

[blee]

(In [452]) Implement bulk operations for confman rmmod and robustify error handling.

See #72

[blee]

(In [453]) Document confman rmmod bulk operations.

See #72

[blee]

(In [454]) Implement bulk operations for confman recipe remove.

See #72

[blee]

(In [455]) Merge from trunk bulk operations for create, rmmod, and recipe remove.

Fixes #72