Add a practracker-regen make target

Makefile.am

@@ -352,6 +352,9 @@ if USEPYTHON
 	$(PYTHON) $(top_srcdir)/scripts/maint/practracker/practracker.py $(top_srcdir)
 endif
 
+practracker-regen:
+	$(PYTHON) $(top_srcdir)/scripts/maint/practracker/practracker.py --regen $(top_srcdir)
+
 check-docs: all
 	$(PERL) $(top_builddir)/scripts/maint/checkOptionDocs.pl