Add get_service_request_line_items.R

[saipavan10-git]

Added function compile_service_request_line_items(). This function assembles parts of the service request, project details, and line item history to make a whole line item.

Updatedget_service_request_lines() to also return username

Modified get_new_project_invoice_line_items() to add the output from get_service_request_line_items() to the final result.

[saipavan10-git]

Addresses #234 , #203

[pbchase]

Your test was chaotic. I reduced the chaos somewhat. You are using data form other tests. that is dangerous. You should not do it. You are loading one table with different data in two different DBs. That seems very odd. Make more of your input locally in this test.