MakeTiles: support additional creation arguments

tile_count: to control how many tiles are generated
skip_tiles: to control which tile to start with

git-svn-id: https://micropolis.googlecode.com/svn/trunk/micropolis-java@851 d9718cc8-9f43-0410-858b-315f434eb58c
MakeTiles: tolerate undefined tiles

git-svn-id: https://micropolis.googlecode.com/svn/trunk/micropolis-java@852 d9718cc8-9f43-0410-858b-315f434eb58c
android port: convert use of java.awt.Rectangle to own CityRect class

java.awt.Rectangle does not exist in the android SDK, so this patch
replaces its use within the Micropolis engine code with a custom class
with equivalent functionality.

This way all the classes in micropolisj.engine can be compiled with
the subset of the Java SDK that also exists in the Android SDK.

git-svn-id: https://micropolis.googlecode.com/svn/trunk/micropolis-java@853 d9718cc8-9f43-0410-858b-315f434eb58c