added buzzer  routines
Merge branch 'master' of https://github.com/gurusfp/billmac_atmega
Merge branch 'master' of https://github.com/gurusfp/billmac_atmega
Merge branch 'master' of https://github.com/gurusfp/billmac_atmega
got test_menu_2 compiling
Merge branch 'master' of https://github.com/gurusfp/billmac_atmega