fixed buy/sell bug, getPreferredPrice() returns 0 instead of false for systems w/o a preferred price
nlua_getPrice accounts for base comm price
map shows base commodity prices
new players wouldn't have economy started
map ignores system's pref. value if no weight
added economic events
economic events
bulk buying now maxes at largest affordable ammt
fixed segfault when system had no listed commodities
food was thought invalid
whoops (fixed last commit)
very minor balancing