SQLite doesn't have an `RLIKE` function, so the query for hashtagged
posts was failing before. This adds a `regexp` function to SQLite and
correctly retrieves all posts on a blog with the requested hashtag.

This closes #55

This avoids reading from the database after a transaction has been
started in CreateUser(), fixing the deadlock that occurred before.

Closes #53

Only check for username and password if driver type is mysql

This enables paging through the entire list of users.

Ref T553

This enables admins on multi-user instances to see all users registered,
and view the details of each, including:

- Username
- Join date
- Total posts
- Last post date
- All blogs
  - Public info
  - Views
  - Total posts
  - Last post date
  - Fediverse followers count

This is the foundation for future user moderation features.

Ref T553

This adds a new `sqlite` build tag that you should include only if you
want SQLite3 support built in. Both `make run` and `make release` create
builds with SQLite included.

This includes schema.sql and sqlite.sql in the release binary, so they
no longer need to be included in the release archives. This reduces the
number of files extracted, but otherwise leaves all functionality as it
was -- especially the --init-db flag.

Ref T536

This closes #1

(not "darwin")

Fixes #50

This supports creating a regular user via the command-line.

This runs usernames through the same checks as the web interface,
ensuring no invalid user is created, such as user_name or userName.

This closes #49

Fix the Docker build when installing go-sqlite

Go-SQLite requires sqlite library headers and gcc.

And Quick Start intro

This adds a "Reader" section of the site for admins who want to enable
it for their instance. That means visitors can go to /read and see who
has publicly shared their writing. They can also follow all public posts
via RSS by going to /read/feed/. Writers on an instance with this
`local_timeline` setting enabled can publish to the timeline by going
into their blog settings and choosing the "Public" visibility setting.

The `local_timeline` feature is disabled by default, as is the Public
setting on writer blogs. Enabling it adds a "Reader" navigation item and
enables the reader endpoints. This feature will also consume more
memory, as public posts are cached in memory for 10 minutes.

These changes include code ported over from Read.Write.as, and thus
include some experimental features like filtering public posts by tags
and authors. These features aren't well-tested or complete.

Closes T554

SQLite support

The field is currently unused in the app, and it was causing problems in
SQLite.

Ref T529

Ref T529

This allows users to load a different configuration file instead of the
default config.ini. It works in combination with other configuration
actions, like --config and --create-config.

Ref T529

Ref T529

Ref T529

Ref T529

This extracts the LEFT/SUBSTR logic into its own datastore.clip() method
that also works correctly with SQLite.

Ref T529

We store times in UTC in all other places, but the post.Created logic
when creating a post meant that dates were being stored in a user's
local timezone. This fixes that.

Ref T529