repo_config: do not let globals override repo settings

This makes it possible to activate the enable_commit_graph,
enable_log_filecount, and enable_log_linecount for individual
repositories, even if the global setting is "0" (default).

The commit that introduced the broken behavior was e189344, and the
commit message of that makes it clear that this wasn't the intended
behavior.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
ui-repolist: Rename section-sort to repository-sort.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
ui: Remember to print ampersand as proper html entities.
scan-tree: Unify gitweb.* and cgit.* settings into one config option.

After some back and forth with Jamie and René, it looks like the git
config semantics are going to be like this:

- gitweb.category maps to the cgit repo config key "section"
- gitweb.description maps to the cgit repo config key "desc"
- gitweb.owner maps to the cgit repo config key "owner"
- cgit.* maps to all cgit repo config keys

This option can be enabled with "enable-git-config=1", and replaces
all previous "enable-gitweb-*" config keys.

The order of operations is as follows:

- git config settings are applied in the order that they exist in
  the git config file
- if the owner is not set from git config, get the owner using the
  usual getpwuid call
- if the description is not set from git config, look inside the
  static $path/description file
- if section-from-path=1, override whatever previous settings were
  inside of git config using the section-from-path logic
- parse $path/cgitrc for local repo.* settings, that override all
  previous settings
ui-repolist: Add "section-sort" flag to control section sorting.

Flag which, when set to "1", will sort the sections on the repository
listing by name. Set this flag to "0" if the order in the cgitrc file
should be preserved. Default value: "1".

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
ui-log: Add "commit-sort" option for controlling commit ordering

This makes it possible to use strict commit date ordering or strict
topological ordering by passing the corresponding flags to "git log".

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
tests: check for proper html entity

Since we're now properly writing ampersand literals as &amp; instead of
as a plain &, we need to update the test accordingly.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Makefile: support FreeBSD libiconv paths

According to Dan Rue <drue@therub.org>, FreeBSD requires the lib paths
to get libiconv from /usr/local.
Makefile: Support OpenBSD just like FreeBSD
Fix man page typo.
syntax-highlighting.sh: Fix command injection.

By not quoting the argument, an attacker with the ability to add files
to the repository could pass arbitrary arguments to the highlight
command, in particular, the --plug-in argument which can lead to
arbitrary command execution.

This patch adds simple argument quoting.
ui-shared: use placeholder for empty commit subject

Display a placeholder when creating links to commits with empty subjects.
This avoids the creation of links of the form <a></a>.
Makefile: remove tags file

Remove tags file from working directory.

Signed-off-by: Jamie Couture <jamie.couture@gmail.com>