added build info txt
performed automatic (via Eclipse) source code clean-up
increased number of points in ring buffer to 200, some code clean up,
made version stirng a resource
added mnemonics for menu (not good supported for internationalized apps)
mofifiying menu, close item added
do not use getExtendenKeyCodeForChar below java ver 1.7, some minor
changes too
now menu item Exit is working properly, also on Mac OS X
About dialog now shows Java version, compatibility with java 1.6 and 1.7 tested
release candidate 2.2