Fixes and simplifications

* Move remote-cmd from connection to an action module.
* Inventory now populates a global variable instead of returning a list.
* Added a `describe` method to connections.
* Cleaned up execute/continue-on-error etc.
* Removed workflow class.

examples/uptime.scm

@@ -1,15 +1,12 @@
 (use-modules (ordo core)
              (ordo inventory)
-             (ordo connection)
+             (ordo action remote-cmd)
              (ordo logger)
              (srfi srfi-26))
 
 (define uptime (task #:name "uptime" #:action (cut remote-cmd <> "uptime" #:return car)))
 
-(define flow (workflow
-              (execute uptime "limiting-factor" '(#:sudo #t))))
 
-(define resolver (load-inventory "examples/inventory.scm"))
-
-;; IDEA: have load-inventory! set an *inventory* parameter and remove the execute methods
-;; that take a <host-resolver> argument, making this implicit.
+;;(setup-logging! #:level 'DEBUG)
+;;(load-inventory! "examples/inventory.scm")
+;;(execute uptime 'all '())