reorganizing planetary Defense and Shield techs to be dealt with in Species.txt like troops are, changing Protection Focus to (in addition to doubling troops) also double max shields and defenses instead of adding a flat amount.  Minorish adjustment to GRO_ENERGY_META shield and defense contribution to reflect recent Defense/Shield overhall.  Semi-deactivated addition of Mining Focus to possible Foci, since not currently used.

git-svn-id: https://freeorion.svn.sourceforge.net/svnroot/freeorion/trunk@5704 dbd5520b-6a0a-0410-a553-f54834df5b05
Merge remote-tracking branch 'svn-mirror/master'