[BUG] No logic in install for certain hard drive sizes

[aarz-snl]

In the function data_retention you have this logic:

if [ "$DISK_80" -lt 30 ]; then
echo -e "\e[31m[!]\e[0m LME Requires 128GB of space usable for log retention - exiting"
exit 1
elif [ "$DISK_80" -ge 90 ] && [ "$DISK_80" -le 179 ]; then
RETENTION="30"
elif [ "$DISK_80" -ge 180 ] && [ "$DISK_80" -le 359 ]; then
RETENTION="90"
elif [ "$DISK_80" -ge 360 ] && [ "$DISK_80" -le 539 ]; then
RETENTION="180"
elif [ "$DISK_80" -ge 540 ] && [ "$DISK_80" -le 719 ]; then
RETENTION="270"
elif [ "$DISK_80" -ge 720 ]; then
RETENTION="365"
else
echo -e "\e[31m[!]\e[0m Unable to determine retention policy - exiting"
exit 1
fi

In it's current form there is no logic that accounts for 30-89. So, anyone who tries to install LME falling within that range will be met with "Unable to determine retention policy - exiting"

Additionally, the echo statement that states "LME Requires 128 GB of space" doesn't align with the first rule which states if less than 30 GB.

[llwaterhouse]

Fixed with #143