Added gdisk options

Added questions to install.sh about gdisk, and decision making
Note:
	The code I added still needs testing
		It's almost midnight and I just wrote the code
	Code needs to be added to fdisk script to actually check for
		gpt partition tables on devices and if they are found,
		run 'gdisk -l $DEVICE' instead
Added check for imitate fdisk mode before checking for valid gdisk path
Made fdisk wrapper actually pass devices to gdisk

Also put a warning that we are ignoring stderr from gdisk,
and some info
Disable gdisk if it's not found
Some versions of 'which' return stderr. Added code to hide it
Merge branch 'testing'