The directory should be the same as the one used in Setup.hs when building
the RGL, where a build directory supplied by cabal is used. This is usually
dist/build/rgl, but it could be different, e.g. when using a cabal sandbox.
+ Changing version numbers and dates here and there.
+ Simplify build-binary-dist.sh since pgf-http need not be built anymore.
+ Use--gf-lib-path to make the sample grammars for minibar compile even if GF
is not installed.
Use the command "dist/build/gf/gf" instead of "gf" to compile the sample
grammars for the minibar, to avoid failing if gf is installed in a directory
which is not in the $PATH.
"gf -server" mode now contains everything needed to run the minibar and
the grammar editor (including example-based grammar writing).
The Setup.hs script installs the required files where gf -server can find them.
These files have been moved to a new directory: src/www.
The separate server program pgf-http is now obsolete.
