connection overlays for '-' and '/' code modified
Merge branch 'master' into pradeep
connection overlay addQuantity modified - tested for author mode
comments added for connection overlay code duplication
Fixed error in Author mode. Functions and Accumulators were causing errors when an expression was checked.
Renamed a test file.
Merge branch 'master' into pradeep

Conflicts:
	www/js/controller.js
	www/js/draw-model.js
Update wording from 'Author' to 'Group' in login.html and public-login.html.
Merge branch 'master' of https://github.com/bvds/LaitsV3
Move documentation around.
Query Changed, to get the right problems in "solve a custom problem"
Merge branch 'master' into ritesh
Bug Fix 2403
Handling return value of getInitial using typeof returnvalue==="number"
in case of any checks using getInitial Function
Updating YouTube link for new video.
Changes in documentation associated with changing
format of sessions table.
Merge branch 'master' into ritesh
Code review for zero initial value fix:  use test
that initial value is a number.
Also, query in available_problems.php doesn't make sense:  reverted to
original.
Query Changed, to get the right problems in "solve a custom problem"
Bug Fix 2403