add @ladyada's libgpiod install instrux to script

add optional aplay-at-startup service to i2samp.sh

Installs service file in /etc/systemd/system/, then disables.  Prompts
user to enable, and triggers reboot dialog if installed.

Import occi util from Adafruit-Occidentalis repo

rgb-matrix.sh: use newer sha1 of github.com/hzeller/rpi-rgb-led-matrix

Keep cron & install ntp

add service unit for managing fbcp under systemd

Checks if we're under systemd, and if so, ensures that fbcp isn't
mentioned in /etc/rc.local, and installs a new unit file to start
fbcp at boot, after network.target.

If not under systemd, retains the old rc.local behavior.

I note this is the only place that the $SYSTEMD var actually seems to get
checked.  I can't, at this time, vouch for what would happen on a sysvinit
box.

Add execute permissions to all scripts

Backups excluded.

just breaks things. sorry to the 1% who have nonstandard apt repo needs

Keep cron & install ntp, so time tasks are still possible

Set C99 for Raspbian jessie

do we even need to specify the dtb?

added missing warning function to adafruit-pitft.sh

added all the transforms!

revert

try to use only softvol device