Update information in the help files for the i2b2 Web Client

The on-line help for the i2b2 Web Client needs to be updated to the current version of the i2b2 Software. The current version is 1.7.10 and was released on 2018-May-14.

The existing documentation will be reviewed and compared against the current functionality of the software to see what features need to be documented. The missing features will be documented and any changes to existing functionality will be updated in the document.