Merge branch 'gitdir'

Fixes rowanj#26
Closes rowanj#86

Update objective-git to deal with re-pointed libgit2 submodule

Trying to find a good balance of distinguishing names

Remove deprecated calls to 'compositeToPoint'

Add notes about issue rowanj#63 to the change log

Fixes rowanj#63

Add pulls of upstream 3rd-party libraries to change log

Add pull request rowanj#62 (issue rowanj#61 fixes) by @RomainMuller t…

…o the change log

Update change log

Update change log

Make latest change log accessible from the Help menu

Fixes rowanj#54