Ldap to ad

See merge request !5

Updated course file import format

changes to support new course Id format and still handle old one

See merge request !3

looks for existing course with old format and replaces its ID with new format - so should not produce duplicates
updated function update_credit_trady_etc_fix handling the 'fixthezero' query string option to handle newer course ID format as the function was hardcoding the course IDs
regardless of the course ID changes, pre-existing issue, if any (code too old for anyone to rememeber) - that function has queries inside that need the sql mode of mysql on the server to be set to NO_UNSIGNED_SUBTRACTION which may already be set on prod, or simply that functionality is not used (it was assuming a very old course ID format starting with '20')

Remove mulder dependency

Remove test data files

See merge request !2

Remove mulder dependency

merge remove-mulder-dependency into master

See merge request !1

added checks to make sure we don't try to import enrollment or staff records if the person record is not in (not found in ldap)

and not remove+insert, but update record where existing
also changed parsing of course id to get more data and get correct course numbers containing letters too

now the cron job takes data from files and imports it into local db
also people info is fetched from ldap
assuming credentials are elevated to permission to get nuid based on uid
used husker scan ldap credentials in test/dev

Initial modifications to remove references to student_db (mulder) and to pull person data from LDAP instead.