Add symbolic names for zero (ROOT,BACK) and fix up for non-recursive make.
Complete the fix for non-recursive make.
Merge pull request #5 from wjjensen/master

Resolve link errors when building shared object
Merge https://github.com/mischasan/aho-corasick

Conflicts:
	GNUmakefile
tweak GNUmakefile,rules.mk
Merge https://github.com/mischasan/aho-corasick
rules.mk consistent with all other projects
Update GNUmakefile
Change "var = $(shell ... )" to "var != ...."