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>

When normalizing a reference name, if there is an error because
the name is invalid, then the memory allocated for storing the
name could be leaked if the caller was not careful and assumed
that the error return code meant that no allocation had occurred.

This fixes that by explicitly deallocating the reference name
buffer if there is an error in normalizing the name.