Update .gitignore to ignore compressed man pages.

Rename PWG raster sample files to avoid using .gz extension.

.gitignore

@@ -1,6 +1,11 @@
 *.a
 *.bck
 *.cgi
+*.1.gz
+*.3.gz
+*.5.gz
+*.7.gz
+*.8.gz
 *.o
 autom4te.cache
 config.h