check_cvc: control click grabs array indices as references.

[d-m-bailey]

ctrl-click in the check_cvc GUI looks for a reference name in between brackets. e.g. [A001] -> A001

The current version will also incorrectly select array indices. e.g. /Xinv/A[10] -> 10
These should be ignored.

In summaryGUI.py subroutine SetCellFilter, change the regex to "(?:\s|^)[([^\]]*)"