Need to add survey with ability to use branching feature

[faisal]

Need to be able to make a survey that has branching feature that will take you to normal results page with no scores and all other stuff.

[khaled]

Created new survey type, Branching Survey (internal name, branch_survey - note that this required increasing the survey_type field of hg_survey table to varchar(20) from varchar(9)). The Branching Survey uses the quiz creation system to build a survey with branching potential. It then uses regular survey results display mode to show results. Notably different, the results page only shows results of questions answered by the user (not the other branch question results).

TEST PLAN:
1. Create a New Survey at http://devwww.healthgurumedia.com/admin/ (Under the Applications->Survey Manager menu).
2. Choose 'Edit Surveys' from the top level tabs.
3. Fill out the fields as normal, BE SURE TO SET THE TYPE TO 'Branching Survey' from the drop down list.
4. From the Edit Surveys Page (the one where all the surveys are listed) find your new survey. It should have type branch_survey. HELPFUL HINT: Take note of the Survey ID here.
5. Click the 'link questions' button for your branching survey. It should take you to the same tool that is used to build quizzes.
6. Build the survey as per how you would build a quiz.
7. Go to any of the http://dev*.healthgurumedia.com/applications/survey/srvyid/<your survey id>.
8. Take the survey, verify that it branches where it should. Verify that the survey shows the proper number of questions.
9. Complete the survey by clicking see survey results button at the end. If need be, log in if you are not already to access the survey results page.
10. Verify that the questions from the branch you answered are shown correctly.

NOTES ON THE BRANCHING SURVEY
Branches in the survey do NOT generate their own unique question in their branch. Like Quizzes, Branching Surveys which use the same questions in different branches are effectively using the SAME question. The repercussion of this is that statistics are based on answers to questions, so when viewing a question answered in a branch, the answers are pooled to the question, NOT the branch.