Mark fake home directories that failed to be created, so we won't
try to remove them and have cleanup just use p_rmdir.

Conflicts:
	tests-clar/clone/nonetwork.c
	tests-clar/online/clone.c
	tests-clar/online/fetchhead.c

Segregate in-memory and persisted remotes

Update showindex example

I find the showindex example to be pretty useful on occasion, but
there were are couple of output tweaks I wanted, plus I wanted the
ability to specify a path to an actual index file instead of having
to open the whole repository.  This makes those changes and expands
the example slightly.

Alternative fix for iterator memory leak

Fixed compilation with =>VS2010

Starting with VS2010 MS ships a stdint.h.

Signed-off-by: Sven Strickroth <email@cs-ware.de>