cat: Fix a typo in usage error printout
manpage: Add separate manpages for each command

Using docker as a model, this update creates separate manpages
for each OSTree command, such that the main manpage is not
cluttered and the separate pages can provide more in-depth detail
and exanples that might be useful to a user.  Each page includes
synopsis, description, example, and a list of options if needd.
This update also alphabetizes the usage error output for ostree
and ostree admin so that it matches the list on the manpage.
Merge branch 'master' of https://github.com/aloverso/ostree
ostree-repo-resolve-rev: Add function to accept a partial checksum

This patch adds a function that will parse a partial checksum when
resolving a refspec.  If the inputted refspec matches a truncated
existing checksum, it will return that checksum to be parsed.  If
multiple truncated checksums match the partial refspec, it is not
unique and will return false.  This addition is inspired by the same
functionality in Docker, which allows a user to reference a specific
commit without typing the entire checksum.

partial checksums: Add function to abstract comparison

This modifies the list_objects and list_objects_at functions
to take an additional argument for the string that a commit starts
with.  If this string arg is not null, it will only list commit
objects beginning with that string.  This allows for a new function
ostree_repo_list_commit_objects_starting_with to pass a partial string
and return a list of all matching commits.  This improves on the
previous strategy of listing refs because it will list all commit objects,
even ones in past history.  This update also includes bugfixes on
error handling and string comparison, and changes the output structure
of resolve_partial_checksum. The new strcuture will no longer return FALSE
without error.  Also, the hashtable foreach now uses iter.  Also
includes modified test file
Merge branch 'partial_checksums'
typo