Bump version number.

Doc/Makefile

@@ -67,7 +67,7 @@ TOOLSDIR=	tools
 
 # This is the *documentation* release, and is used to construct the file
 # names of the downloadable tarballs.
-RELEASE=2.2a3
+RELEASE=2.2a4
 
 PYTHON=	   python
 DVIPS=	   dvips -N0 -t $(PAPER)

Doc/texinputs/boilerplate.tex

@@ -7,5 +7,5 @@
 
 \date{\today}			% XXX update before release!
 \release{2.2}			% software release, not documentation
-\setreleaseinfo{a3}		% empty for final release
+\setreleaseinfo{a4}		% empty for final release
 \setshortversion{2.2}		% major.minor only for software