* Don't bother prefixing commands with a line of ${_MKCMD}\
and instead rely upon "make -s". This is less intrusive on
all the Makefiles than the former. Idea from David Laight.
* Rename the variables use to print messages. The scheme now is:
_MKMSG_FOO Run _MKMSG 'foo'
_MKTARGET_FOO Run _MKMSG_FOO ${.TARGET}
From discussion with Alistair Crooks.
* Implement GROFFYSRCS, which contain a list of .y files to convert into
.cpp and _tab.h. Simplifies .y -> .cpp (et al) .
* Use "realall" target instead of "dependall"/"install" to ensure that
various files are created correctly.
