changed radiohd to python3, and made it run

config/hdl_buildset_unb2b.cfg

core/check_config

core/config_variable.py

core/configfile.py

core/configtree.py

core/export_config_variables.py

core/export_hdllib_variables.py

core/generate_ip_libs

core/hdl_libraries_wizard.py

core/hdl_raw_access.py

core/modelsim_config

core/modify_configfiles

core/quartus_config

core/test/t_hdl_configfile.py

core/test/t_hdl_configtree.py

doc/.~lock.HDL User manual.docx#

doc/hdltool_readme.txt

init_radiohdl.sh

ise/run_impact

ise/run_ise