fix bug reading option in volCComponentCounter

[kerautret]

PR Description

Fix bug reading option in volCComponentCounter

Checklist

• [n.a] Doxygen documentation of the code completed (classes, methods, types, members...)
• [n.a] Check if it follows the tools structure described in CONTRIBUTING.md
• New entry in the ChangeLog.md added.
• [n.a] Update the readme with potentially a screenshot of the tools if it applies.
• No warning raised in Debug cmake mode (otherwise, Travis C.I. will fail).

[dcoeurjo]

fine for me. What was the bug you have with this tool ?

[kerautret]

The count of Connected components looks not always good: for instance try :
bugCCCounter.vol.zip
it produce 4 cc while it looks to be 3.

[kerautret]

@dcoeurjo perhaps I add an issue for the fix and assign to you ? ;)

[dcoeurjo]

Yes, please do so

[kerautret]

done #255
So merging thanks ;à