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This PR allows CommCare forms to be transformed into an [ODM-formatted][2] (XML) document, which OpenClinica can import, using a custom report and export. \r\n\r\nSome data needs to be created in OpenClinica and cannot be imported in an ODM document: Users; Subjects; and Events (which we work out from the start and end times when forms are filled out). This last one is particularly painful, because it means that a user will have to look at the report in CommCare to see a list of events for each subject, and then schedule those events manually in OpenClinica, before being able to import the data. Future integration will hopefully use OpenClinica web services via MOTECH, which will avoid this extra work because events can be scheduled using web services.\r\n\r\nI've tried to break this PR into bite-size chunks for review. The most important commit is probably 7cb8c27 but you may want to go through the previous commits to understand how we get there.\r\n\r\nThis what the ODM Export report looks like, showing the Events to be scheduled in OpenClinica:\r\n![oc_odm_export_report](https://cloud.githubusercontent.com/assets/708421/10318466/e9f69784-6c69-11e5-9719-a77eab6ff607.png)\r\n\r\n(That export button says \"Export to Excel\". I will be fixing that shortly to say \"Export as ODM\".)\r\n\r\nAnd this is the same data exported as an ODM document and imported into OpenClinica:\r\n![oc_successful_import](https://cloud.githubusercontent.com/assets/708421/10318508/12d3818a-6c6a-11e5-9bd9-1d77ca5ef273.png)\r\n\r\n(Spot the typo? Yep, I wrote \"Cantopril\" instead of \"Captopril\". Oops.)\r\n\r\ncc @NoahCarnahan and anyone else who has the time and enthusiasm to dive into this one.\r\n\r\n\r\n  [1]: https://openclinica.com/\r\n  [2]: http://www.cdisc.org/odm\r\n","created_at":"2015-10-06T18:54:32Z","updated_at":"2015-10-06T18:54:32Z","closed_at":null,"merged_at":null,"merge_commit_sha":"d34174431a7ea9d3d033b4781804f1269c1f1af3","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/dimagi/commcare-hq/pulls/8518/commits","review_comments_url":"https://api.github.com/repos/dimagi/commcare-hq/pulls/8518/comments","review_comment_url":"https://api.github.com/repos/dimagi/commcare-hq/pulls/comments{/number}","comments_url":"https://api.github.com/repos/dimagi/commcare-hq/issues/8518/comments","statuses_url":"https://api.github.com/repos/dimagi/commcare-hq/statuses/6c8945097780d0acfe095a261a106cce7c359be3","head":{"label":"dimagi:openclinica_bitesize","ref":"openclinica_bitesize","sha":"6c8945097780d0acfe095a261a106cce7c359be3","user":{"login":"dimagi","id":94514,"avatar_url":"https://avatars.githubusercontent.com/u/94514?v=3","gravatar_id":"","url":"https://api.github.com/users/dimagi","html_url":"https://github.com/dimagi","followers_url":"https://api.github.com/users/dimagi/followers","following_url":"https://api.github.com/users/dimagi/following{/other_user}","gists_url":"https://api.github.com/users/dimagi/gists{/gist_id}","starred_url":"https://api.github.com/users/dimagi/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dimagi/subscriptions","organizations_url":"https://api.github.com/users/dimagi/orgs","repos_url":"https://api.github.com/users/dimagi/repos","events_url":"https://api.github.com/users/dimagi/events{/privacy}","received_events_url":"https://api.github.com/users/dimagi/received_events","type":"Organization","site_admin":false},"repo":{"id":247278,"name":"commcare-hq","full_name":"dimagi/commcare-hq","owner":{"login":"dimagi","id":94514,"avatar_url":"https://avatars.githubusercontent.com/u/94514?v=3","gravatar_id":"","url":"https://api.github.com/users/dimagi","html_url":"https://github.com/dimagi","followers_url":"https://api.github.com/users/dimagi/followers","following_url":"https://api.github.com/users/dimagi/following{/other_user}","gists_url":"https://api.github.com/users/dimagi/gists{/gist_id}","starred_url":"https://api.github.com/users/dimagi/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dimagi/subscriptions","organizations_url":"https://api.github.com/users/dimagi/orgs","repos_url":"https://api.github.com/users/dimagi/repos","events_url":"https://api.github.com/users/dimagi/events{/privacy}","received_events_url":"https://api.github.com/users/dimagi/received_events","type":"Organization","site_admin":false},"private":false,"html_url":"https://github.com/dimagi/commcare-hq","description":"A 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