[Freeciv-Dev] Patch: tech advances updates

["Andrew McGuinness" <andrew@xxxxxxxxxxxxxxxxxxx>]

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There are six different ways of getting a new tech:
- - research it (including getting it as a freebie after philosophy)
- - get it from a hut
- - get it from another player by treaty
- - steal it with a spy
- - find it when conquering or subverting an enemy city
- - get it from the Great Library

A lot of stuff has to be done for each one - checking if city
squares need to be upgraded to rails, incrementing researchpoints,
checking if a different tech needs to be researched, and so on.  I 
have pulled most of this into one function, and cleared up a couple 
of very small bugs on the way. (Other players with embassies not 
being informed when tech is stolen by capture, for instance).

I have also provided a function notify_embassies(), to handle the 
job of notifying players who have embassies with a given player of 
things that have happened.

This is my first effort in this kind of development, so all criticism is 
welcome.


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Andrew McGuinness                     andrew_mcguinness@xxxxxxxxxxxxx
Luton, Beds. UK

adv_updates.diff.gz
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