BNFC 2.9.4.1

• C/C++: allow space characters in token definitions again [#431] (regression in 2.9.0)
• installation: get rid of cabal-doctest dependency [#429]

Tested GHC versions:

• with cabal, GHC 7.10 - 9.4
• with stack, GHC 8.2 - 9.4

Linux64	bnfc-2.9.4.1-linux-x86_64.binary
Mac	BNFC-2.9.4.1-mac.pkg
Source	BNFC-2.9.4.1.tar.gz
Win	bnfc-2.9.4.1-win.exe