run the tog tests as part of the default regress set ok and README update by jamsek

have 'make clean' traverse into regress/gotd in order to remove gotd.conf

add a simple deltify test

tweak parse_uri() function, declare it as public API, and add a test for it

retire C tests which depended on Got's own Git repository to run

add a test for got_compare_paths()

remove the pathset abstraction again; replaced by RB tree

add got_pathset API which manages a tree of paths

add a command line test suite with a simple 'got checkout' test

add a Makefile hierarchy which builds the whole show