The function `git_packfile_stream_open` tries to free the passed
in stream when an error occurs. The only call site is
`git_indexer_append`, though, which passes in the address of a
stream struct which has not been allocated on the heap.

Fix the issue by simply removing the call to free. In case of an
error we did not allocate any memory yet and otherwise it should
be the caller's responsibility to manage it's object's lifetime.

Coverity fixes

Better document `git_merge_commits` redux

`git_merge_commits` and `git_merge` now *do* handle recursive base
building for criss-cross merges.  Remove the documentation that says
that they do not.

This reverts commit 5e44d9bc.

mailmap: add ethomson@github.com

When copying contents of the cURL certiinfo we duplicate the
data but forget to actually put it into the vector.

Introduce Contributor Covenant

Free allocated pointer to curl stream on error

winhttp: name mangle class / iid on mingw

Export git_stash_apply_init_options

Fix typo

Fix a typo in documentation

Standard Windows type systems define CLSID_InternetSecurityManager
and IID_IInternetSecurityManager, but MinGW lacks these definitions.
As a result, we must hardcode these definitions ourselves.  However,
we should not use a public struct with those names, lest another
library do the same thing and consumers cannot link to both.

Make packfile_unpack_compressed a private API

Fix some issues with generated pkg-config file

ssh_stream_read(): fix possible *bytes_read < 0 branch

index: get rid of the locking

We don't support using an index object from multiple threads at the same
time, so the locking doesn't have any effect when following the
rules. If not following the rules, things are going to break down
anyway.

Handle dotfiles as the repo template dir and inside the template dir

Include dotfiles when copying template directory, which will handle
both a template directory itself that begins with a dotfile, and
any dotfiles inside the directory.

Ensure that we can handle template directories that begin with a
leading dot.

Ensure that `git_repository_init` honors the `init.templatedir`
configuration setting.

Update README URLs based on HTTP redirects

Fix a couple function signatures

Fix the possibility of returning successfully from ssh_stream_read()
with *bytes_read < 0. This would occur if stdout channel read resulted
in 0, and stderr channel read failed afterwards.