Tradedangerous

Fixed excessive CPU usage in emdn-tap.py (ty, jojje)
Added 'cleanup' command to help remove bad data from emdn
EMDN isn't foolproof, and sometimes receives invalid or
deliberately poisoned data. The best way to detect this
is currently to look for prices that are somewhat older
than the rest of the information received for the same
station. This command checks for those records and
removes them.
emdn-tap now tries harder to honor commit intervals.
API Changes:
makeSubParser now takes an epilog

- New option "edcd" to download FDevShipyard and FDevOutfitting data.
- Using new mapping classes to map the IDs from the API.
- Delete old ShipVendor entries to avoid stale data.

Jul 01 2016 (bgol, horizon branch):

Jun 30 2016 (bgol, devel branch):
. Added autoconfirm (--yes) to edsmupdate.py
. Added FDEV ID to Item and Ship table for API mapping.
. Added average price to Item table (as shown ingame).

Jun 28 2016 (bgol, horizon branch):
. (maddavo) Renamed item "Low Temperature Diamond" to "Low Temperature Diamonds"
. added EDSM utils (implemented issue 1)

Jun 21 2016 (bgol, horizon branch):
. Renamed item "Power Transfer Conduits" to "Power Transfer Bus"

Jun 10 2016 (bgol, horizon branch):
. "--no-planet" switch now requires planetry to be "N" (issue 5)
. Updated README
. data update from maddavo
. New items for 1.6/2.1 update

Added DB support for tracking item stock/demand levels,
TradeCalc will now factor stock levels when present,
Minor performance/memory tweak
emdn-tap:
Now accepts --warn-to argument,
Applies filters to what data it will accept,
Records item stock/demand levels to the DB

Dec 21 2015 (bgol, horizon branch):
. Don't merge the prices form maddavo anymore (use --merge-import if you need it).
. New items with version 1.5/2.0 of ED
. data update from maddavo
. Added "planetary" column to station table and maddavo import.
. Added "--planetary" argument to station command.
. Added "--no-planet" switch to buy, local, nav, rares, run and sell command.
. Added "Plt: X" output.