#253 Grabs all available SHM IDs under java-1.7.0-openjdk

[Robert Nichols]

When run under java-1.7.0-openjdk, HoDoKu grabs thousands of SHM IDs when it is started and each time a new sudoku is started. This quickly exhausts the system limit on SHM IDs (typically 4096), preventing the "paste" function from setting up a new sudoku, and can cause other processes on the system to fail.

Workaround is to run with the java-1.6.0-openjdk engine, where HoDoKu grabs just 3 SHM IDs at startup and no more after that.