Retrieve Beyond Compare's path from registry
Switch from a hardcoded path to registry key to find Beyond Compare's
executable. Calling BCompare.exe works fine with version 3.0.14.
*** failed to import extension badext from .../badext.py: bit bucket overflow
*** failed to import extension badext2: No module named badext2
hg help [TOPIC]
show help for a given topic or a help overview