The edit in place feature, and calling the API from Javascript, is not working in some hosting configurations

These features ae not working when CiviCRM websites are hosted:

• without pretty URL's enabled (ie. domain.org/index.php?q=civicrm/xxx rather than domain.org/civicrm/xxx)
• or in a subdirectory (ie. domain.org/chapter/civicrm, localhost/vhost/civicrm, etc.) the edit in place feature, and cj().crmAPI()

This is because callbacks are hardcoded to /civicrm/xxx, rather than being calculated through the crmURL function.

To reproduce: setup a civiCRM vhost that is reached via a subdirectory structure on the URL, go to the Administer / Administer data and Screens / Profiles and try doing an edit in place on the name of one of the profiles in the list.

This has been fixed in 4.3, so we probably need a backport of some of these changes to 4.2.