Some fixes for crew contracts bulletin

"new calculations for $wage negotiation and some fixes"

second attempt (#2157)

- minimal possible wage offer is now $1
- more more less possible overflow error for upper wages (smaller linear offset)
- not be made again offers accepted actually by NPC (and never more chaotic in the lower value of wages)
- a series (in a row) accepted reduction the offer by NPC will never lost now, (earlier lost after: "HANG UP", "HANG UP" after NPC test, "Make offer" & no crew cabin...maybe more accidental combination). If all is intended, is not really cool and logical for me.
- New, candidates hate unattractive offer (relationship -1)
- money format for "crew for hire" list