Improve the commit message

[zalmanu]

Right now when multiple files are changed in a commit, the following message is used: Update x items, where x is the number of items being updated. However, the commit history would be much clearer if we would group multiple changes and create a base message that will be used as the commit message for those changes.

E.g.:

• When a directory with 3 items is removed, gitfs will use the message: Update 3 items. This is not very clear, because although on the os level 3 files were updated, what we actually did was to delete the directory. The much clearer version would be Delete the x directory.
• If we change 3 files, we get the same message. In this case it would be much cleaner to display a message similar to: 'Update 3 items: Add x, Remove y, Update z'.

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