Bug fixes
Revert "tab change improvements"

This reverts commit 3fe406ed3c7b9298c80a4cb00ec605bfa3f885fd.
Revert "Revert "tab change improvements""

This reverts commit 4ed79720cee61194beb2f9718b9825719c1abd2e.
Coached mode - disable create node button if vertices in graph already
fixing edges in calc view
issue 1 in Kurt's email - edge improvements on calc panel
Issue 3 in Kurt's email - disable create node button on calc panel on check
Tab change improvements for coached.  Fixes check/demo availability issues
Changes from code review:  comments and minor change.
Fixed bugs discovered this morning in Calc panel
New Accumulator text in Calc panel
Fixed bug where checking out of order node in newnodedialog in coached mode would still create a vertex
Stops nodes made in NewNodeDialog in Author mode from being deleted upon close
Changes to postvar.php by, I think, Ram.  See Bug #2222.
fix infinite loop on load debug problems
Calc panel red on load of incorrect node
Desc panel color on loading old node
typo fix
Work-around for Bug #2212 --- disable test for node already
created in COACHED mode.
:wq
Merge remote-tracking branch 'origin/master' into sita