#642 Change PKG_DIR convention

[Don Porter]

As noted in

https://sourceforge.net/mailarchive/message.php?msg_id=30251660

the established convention for PKG_DIR in Makefile.in

PKG_DIR= $(PACKAGE_NAME)$(PACKAGE_VERSION)

cannot work well for packages that make the unfortunate choice
to end their package name with a number.

An alternative convention

PKG_DIR= $(PACKAGE_NAME)-$(PACKAGE_VERSION)

would take care of them, and also align better with
other packaging standards out there, AIUI.

[Stuart Cassoff]

I'm all for this.

[Stuart Cassoff]

Perhaps I spoke a bit too quickly.
My personal preference would be for the topmost *source* dir of the package to be named '
'name-ver' and the install dir to simply be 'name' but that might not be practical so I'm fine with an install dir of 'name-ver'.