sensing (reading the SCL line to find out if slave pulls it low)

(made original from opensource.org version)

drive out '1' instead of 'Z'. It also removes the Warning (12620): Input port OE of I/O output buffer is not connected, but the atom is driving a bi-direct...

New testbenches for UniBoard2 sens and pmbus. They run but still need to add self checking. Also generic model for i2c pmbus devices

SVN copied data and hex directories so that they can be referred to from $RADIOHDL instead of from $UNB.
SVN copied python, doc, matlab sub directories in tb or src to $RADIOHDL as well.
Only common/hdllib.cfg still refers to $UNB because some low level components (multipliers) are not technology independent yet.

Renamed key hdl_lib_uses into hdl_lib_uses_synth and added new key hdl_lib_uses_sim for extra test_bench_files library dependencies.

Renamed build_sim_dir into build_dir_sim, similar build_dir_synth. Use <tool_name>_copy_key based on build type 'sim' or 'synth' from hdltool.cfg. Renamed sim_tool_name into tool_name_sim in hdltool.cfg, similar for synth_tool_name.

Used hdl_config.py with mode=1 to change build_synth_dir key value into /home/kooistra/svnroot/UniBoard_FP7/RadioHDL/trunk/build for all hdllib.cfg dictionary files.