Add frequent views

[wildtayne]

This PR adds the frequent user views discussed in #134. Again, I am creating this PR so this code can be reviewed prior to integration with the new user role system.

• The specifications for each object can be found here
• Please point out any inconsistencies between the two, since there are some cases where the specification may be less correct than the code
• Many of these views user a three-tier approach for student access. A student SELECTS a view in the public schema, which executes a SECURITY DEFINER function in the public schema, which executes a function in the ClassDB schema. This allows students to access otherwise privileged data through a view.

Fixes #134

[wildtayne]

I just pushed a much improved version of the views.

• It complies now
• All functions/views have correct permission levels
• I have temporarily removed LastDDLOperation from relevant views for testing purposes, since it is missing elsewhere in the DB (see here). I can re-add this if we want it back.

[wildtayne]

Also, strictly speaking, this PR should be blocked until the DDL/Connection activity attributes are implemented in ClassDB.User/Instructor/Student/DBManager.

[wildtayne]

Closing until dir reorg is done

[wildtayne]

Reopened now that the directory reorg is done. Views are now added in src/db/reco/addFreqeuntViewsReco.sql.

BTW - Doing a clean install of ClassDB is now very streamlined with the new directory structure 👍