Create unsequester_project

[pbchase]

Create a new function unsequester_project. It should live in project_sequestration.R We need this function before we start sequestering paid projects.

unsequester_project should do these things:

• set sequestered = 0 in the table redcap_entity_project_ownership
• set completed_time = NA, completed_by = NA in the redcap_projects table.
• accept a vector of project_ids as input
• exit gracefully if the vector of project_ids is empty
• Use redcapcustodian::sync_table2 to make updates to the tables
• Return a vector of project_ids modified or as.numeric(NA) if none.

For a project state reference see the behavior of REDCap's ProjectGeneral/change_project_status.php.