correct reporting of empty solution

git-svn-id: http://svn.mkgmap.org.uk/splitter/trunk@405 838fabe5-b1a8-4b81-9896-7a84386980e9
see log -> see stdout messages

git-svn-id: http://svn.mkgmap.org.uk/splitter/trunk@406 838fabe5-b1a8-4b81-9896-7a84386980e9
make option --description work again

git-svn-id: http://svn.mkgmap.org.uk/splitter/trunk@407 838fabe5-b1a8-4b81-9896-7a84386980e9
fix merging of "precomp-sea" data when planet is used as input

(this makes no sense, but it should not fail with an 
ArrayIndexOutOfBoundsException)

git-svn-id: http://svn.mkgmap.org.uk/splitter/trunk@408 838fabe5-b1a8-4b81-9896-7a84386980e9
duplicate searchLimit if start value gives no acceptable solution.
(least populated tile has < 50% of max-nodes)
If "brute force" algo is in use and no good split was found, try
also "spread" algo.
This helps to split e.g. Japan.

git-svn-id: http://svn.mkgmap.org.uk/splitter/trunk@409 838fabe5-b1a8-4b81-9896-7a84386980e9