hg.py: add islocal() and defaultdest() functions, refactor islocal tells if a repo or url is local. defaultdest returns default path for clone if explicit path not given. clone can now take repo or url as source

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