Tradedangerous

. (kfsone) Initial Beta 3 changes
- Improved the "corrections" system which facilitates changing names
between versions, you can now "correct" System, Station, Category
and Item names;
- Renamed "Drugs" to "Legal Drugs", guess we need to add "Illegal Drugs"
- Renamed some obvious items (Hel-Static Furnaces -> Microbial Furnaces),
- Added some items that looked new (but could be renames),
- Renamed Hopkins Hangar -> Cori Terminal

. (kfsone) Added "buy" sub-command for looking up sales of an item

. (kfsone) Added support for self-correcting star/station name changes,
. (kfsone) Added name corrections for maddavo's current TradeDangerous.prices,
. (kfsone) Assorted minor API changes,
. (kfsone) Minor startup optimization pass

. (kfsone) Added "--supply" (-S) which shows supply (demand and stock) fields when editing,
. (kfsone) Added "--timestamps" (-T) which shows timestamp field when editing,
. (kfsone) Added "--force-na" (-0) which replaces 'unk' values with 'n/a' (use with care),
. (kfsone) Deprecated "--all" and "--zero",
. (kfsone) Minor fixes to new .prices format

. (kfsone) New extended .prices format:
<item name> <sell> <buy> <demand> <stock> [<time>]
Demand/stock can be:
unk :- "unknown" - treat as though always available
n/a :- "not available" - ignore in trade calcs
0 :- alias for "n/a"
or the number of units followed by L, M or H, e.g.
10L :- 10 units at Low
500M :- 500 units at Medium
9000H :- 9000 units at High
Note that the time has moved to the end of the line.
When updating data, you can either remove the time and have it
default to 'now' or you can explicitly write the word now.
. (smacker65) Couple of station name corrections
. (kfsone) Better feedback when price data could not be found
. (kfsone) .prices wiki page
. (smacker65) More star data and corrections
. (gazelle) Fix for "--zero" and, e.g., "-1L0"