Add branchtags function with cache - cache stores tipmost node and rev and node,label pairs - if cache is out of date, scan new changesets - write new cache out after scan

CC := gcc
CFLAGS := -g -O2 -Wall -Werror

prefix ?= /usr/bin

hgsh: hgsh.o
	$(CC) -o $@ $<

install: hgsh
	install -m755 hgsh $(prefix)

clean:
	rm -f *.o hgsh