v1.8: ship upgrades, better stats display

README

@@ -28,7 +28,7 @@ basic game launch command.
 == In-game commands ==
 
 As you launch a fresh game, you start on the planet Lave of Galaxy 1, 
-on a ship with 20t of cargo space, with 100 credits of cash.
+on a Cobra Mk3 ship with 20t of cargo space, with 100 credits of cash.
 From now on, the following commands are available (case-insensitive):
 
 * buy (product) (amount): buy specified amount of specified product
@@ -41,7 +41,7 @@ From now on, the following commands are available (case-insensitive):
   (the planet must be in the same galaxy as you)
 * mkt: show local planetary system market prices
 * local: list planetary systems within 7 lightyears (your max fuel capacity)
-* hold: expand your cargo bay to 35t for 400 credits (one-time upgrade only)
+* upgrade: expand your cargo bay by upgrading your ship or buying a new one
 * stat: show player statistics and overall rank
 * save (name): save the gamestate in the current working directory
 * load (name): load the gamestate from the current working directory
@@ -49,22 +49,22 @@ From now on, the following commands are available (case-insensitive):
 * rand: toggle between the AWK's native PRNG (default) and a custom one
 * quit: quit the game
 
-All commands except "hold", "save" and "load" can be abbreviated by their
+All commands except "upgrade", "save" and "load" can be abbreviated by their
 first letter. In addition, trade goods names can be abbreviated too (by several
 first letters). E.g. "b fo 5" is the same as "buy Food 5", and "q" is "quit".
+The "upgrade" command can be abbreviated as "up".
 
 Fuel price is fixed at 0.2 CR/LY, you can hold 7LY of fuel at most.
 
 == Gameplay differences from the original TE 1.5 C version ==
 
-As of the current version, 1.7:
+As of the current version, 1.8:
 
 * multiple typos corrected in text strings
 * the "cash" and "sneak" commands were removed since v1.6
 * galaxy jumps are no longer free and cost 5000 credits each
   (like in classic Elite and Oolite)
-* cargo hold expansion also is non-free (400 credits) and can only be
-  done once from 20t to 35t (like in classic Elite)
+* cargo hold expansion also is non-free and (since v1.8) multi-tiered
 * alien items are available by default
   (can be overridden with -v NO_ALIEN_ITEMS=1)
 * economy names are no longer shortened
@@ -77,6 +77,7 @@ As of the current version, 1.7:
 * since v1.6.3, galaxy names are also displayed with "local" command
   (the names were taken from the Archimedes version of Classic Elite)
 * since v1.7, basic ranking and statistics have been introduced
+* since v1.8, "hold" command was replaced with "upgrade" with several ships
 
 To be continued. This list is expected to grow in the future.
 
@@ -163,11 +164,18 @@ difficulties such as police and pirate attacks.
 
 Highly unlikely. One of the project goals is to keep it simple.
 
-- Are there going to be any further ship upgrades besides the "hold" command?
+- Are there ship upgrades available in awlite?
 
-Very likely, closer to version 2.0. Particularly, ability to buy another ship
-of a different class (with a much larger cargo bay) is
-being designed.
+Yes, since v1.8, awlite offers 5 upgrade tiers similar to Oolite trade ships:
+
+* Cobra Mk3 Extended (35t, 400 CR) - like in the original Elite versions
+* Python (100t, 200000 CR)
+* Boa (125t, 450000 CR)
+* Boa 2 (175t, 495000 CR)
+* Anaconda (750t, 650000 CR)
+
+You can list and select them with the "upgrade" (or "up") command.
+Note that once you upgrade to a better ship, previous tiers become unavailable.
 
 - How large is awlite?