[Freeciv-Dev] [PATCH] Display "Research every n turns"

[s830@xxxxxxxxx]

Here's a patch that displays how often you get a new research.
It displays this, both in the science advisor screen and in the change
tax-rate dialog. It's only implemented for the gtk client.

I've created a function "turns_to_research" that calculates the research,
I'm not sure if it is too costly, but I couldn't find a good way to
calculate total research other than the brute-force method.
I've placed the function in "common/tech.c", I'm not sure on both the
function name or placement though, as usual :-)

Comments and critics are always welcome

research-turns.diff
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