(svn r17346) [0.7] -Backport from trunk:

- Document: how to manually install AIs
- Fix: Memory leak when trying to bankrupt the local company, other minor improvements of bankruptcy (r17342, r17341, r17340)
- Fix: Not all non-ASCII characters were entered with escapes in the About window (r17309)
- Fix: [NoAI] AIRail::RemoveRailTrack returned ERR_PRECONDITION_ERROR for road/rail-crossings (r17307)

src/economy.cpp

@@ -469,6 +469,7 @@ static void CompanyCheckBankrupt(Company *c)
 	/*  If the company has money again, it does not go bankrupt */
 	if (c->money >= 0) {
 		c->quarters_of_bankrupcy = 0;
+		c->bankrupt_asked = 0;
 		return;
 	}
 
@@ -521,7 +522,7 @@ static void CompanyCheckBankrupt(Company *c)
 				 * he/she is no long in control of this company. However... when you
 				 * join another company (cheat) the "unowned" company can bankrupt. */
 				c->bankrupt_asked = MAX_UVALUE(CompanyMask);
-				c->bankrupt_timeout = 0x456;
+				free(cni);
 				break;
 			}