BUG: fixed the "error: taking address of temporary array" message.

New gcc version don't support temporary arrays.
Fixed a bug where old patches where used on extrude

This caused the extrude function to work as aspected only the first time.
selectedPatches is now cleared before extrusion.

Also found another place which required clearing of the selectedPatches.
added command line argument which loads a blockMeshDict
Merge remote-tracking branch 'upstream/master'

Conflicts:
	src/HexBlock.cpp
	src/HexBlock.h