correcting student selection query

Student selection query was selecting students who had dropped the course.
Merge branch 'master' of https://github.com/lkozloff/ELReportCards

Conflicts:
	index.php
synchronizing
adding example data.php file
adding data.php.example to show addition to OpenSIS' data.php
updating teacher selection query for teachers

KhmerTAs are now stored in the DB, so we want to exclude their profile type.
Making initial presentation more intuitive.

Adding "Please Select a Student" message. Just having a comma is
too hard to click on and I've gotten 2 questions about it over the
weekend!
Merge branch 'next'

Conflicts:
	index.php
Merge branch 'next'
ignoring test files
updating change history
Merge branch 'next'
making khmer teacher field conditional
looking nicer
adding option to not have Khmer teacher
changing calculation of days in semester
fixing semester date calculation
updating semester days calculations
removing error checking code (whoops!)
adjusting margins