[Freeciv-Dev] patch: split up F_SUBMARINE (PR#347)

[David Pfitzner <dwp@xxxxxxxxxxxxxx>]

The unit flag F_SUBMARINE currently incorporates several effects.
For alternate rulesets it may be useful to have these effects
separately, so this patch splits F_SUBMARINE into:

  F_SUBMARINE_INVIS - invisibility effect (usefulness reduced by fog, 
                but still some effect vs cities and visibility-2 units);
  F_MISSILE_CARRIER - transport_capacity is for F_MISSILE units only;
  F_NO_LAND_ATTACK  - cannot attack vs land (no shore bombardment).

This patch makes a reasonable attempt at backward compatibility 
(non-mandatory cap str) including reading old ruleset files.  
(It fails (only in minor ways?) for non-standard rulesets using 
new flags above -- too bad, we'll probably have another +cap
soon enough anyway.)

-- David

submarine_flags.diff.gz
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