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change cpufreq threshold to 70% rather than 95%

Dom says the system is more responsive, and there is agreement it is safe
enough.
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Edited layout and text to (hopefully) improve usability
Updated in response to comments from popcornmix
make expand_rootfs work even if root is not /dev/mmcblk0p2

The tool is still very cautious as to when it will work. Refuses to work if
/dev/root is not /dev/mmcblk0*
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Merge pull request #19 from Rob-Bishop/master

Edited layout/text with the aim of improving usability
Merge branch 'master' of github.com:asb/raspi-config
fix messed up indentation (we standardise on 2 spaces)
replace use of resize with direct calls to tput

Also choose a minimum size for the whiptail width and height: the ui just
doesn't work right when too small and drawing it at a sensible size means the
user can resize their terminal.
use case to dispatch main menu
use case to dispatch internationalisation menu functions
use case to dispatch advanced menu
move overclock from advanced menu to main menu
for now refuse to work on anything but trivial partitionings

In particular, refuse to work on NOOBS (parted doesn't like the partition
layout). Reassure users that if using NOOBS, the rootfs is already expanded.
bump version
delete debian/ files that should never have been added
Fixed height suitable for all displays. Scalable width so that more text is visible on widescreen displays
WT_HEIGHT changed to 17 for extra prettiness