increase in cost of the very easy Industrial Center techs.

git-svn-id: https://freeorion.svn.sourceforge.net/svnroot/freeorion/trunk@5720 dbd5520b-6a0a-0410-a553-f54834df5b05
Added key changes to the top of the changelog.

git-svn-id: https://freeorion.svn.sourceforge.net/svnroot/freeorion/trunk@5721 dbd5520b-6a0a-0410-a553-f54834df5b05
clarified a few production building descriptions.

git-svn-id: https://freeorion.svn.sourceforge.net/svnroot/freeorion/trunk@5722 dbd5520b-6a0a-0410-a553-f54834df5b05
fixed wrong icon for symbiotic hull.

git-svn-id: https://freeorion.svn.sourceforge.net/svnroot/freeorion/trunk@5723 dbd5520b-6a0a-0410-a553-f54834df5b05
Slightly groomed patch by Dilvish that fixes mid-turn batch build changes so that undoing changes on the same turn doesn't result in wasted progress.

git-svn-id: https://freeorion.svn.sourceforge.net/svnroot/freeorion/trunk@5724 dbd5520b-6a0a-0410-a553-f54834df5b05
reduced Nacent A.I. bonus to a flat 2 RP per planet.

git-svn-id: https://freeorion.svn.sourceforge.net/svnroot/freeorion/trunk@5725 dbd5520b-6a0a-0410-a553-f54834df5b05
Macro control to adjust costs of all techs uniformly.

git-svn-id: https://freeorion.svn.sourceforge.net/svnroot/freeorion/trunk@5726 dbd5520b-6a0a-0410-a553-f54834df5b05
Merge remote-tracking branch 'svn-mirror/master'