Filip Navara 6e2a59e4ce Use commit graph files for listing pages ()
* Experimental support for git commit graph files and bloom filter index

Signed-off-by: Filip Navara <filip.navara@gmail.com>

* Force vendor of commitgraph

Signed-off-by: Filip Navara <filip.navara@gmail.com>

* Remove bloom filter experiment and debug prints

* Remove old code for building commit graphs

* Remove unused function

* Remove mmap usage

* gofmt

* sort vendor/modules.txt

* Add copyright header and log commit-graph error
..
commitnode.go Use commit graph files for listing pages ()
commitnode_graph.go Use commit graph files for listing pages ()
commitnode_object.go Use commit graph files for listing pages ()
commitnode_walker_ctime.go Use commit graph files for listing pages ()
doc.go Use commit graph files for listing pages ()