Has been superseded by the previous commit.

Don't wait for an optimistic write to fail.  This is an improved
workaround for the infamous Raspberry Pi bug (see commit af991765).
It works much better and comes without the negative side effects.  The
old workaround is now obsolete.

Add enum InputResult which is a tri-state.  Input plugins may now fail
and just become unavailable.

Move code from CreateConfiguredDatabase() and add XDG support.  This
implements an automatic Linux fallback for the setting "db_file" if
none was specified.

Add class Context which wraps the Android/Java Context class and add a
JNI wrapper for method Context.getCacheDir().

Stole my own code from another project :-)

Hard-coded path.  Will be replaced soon.

This was accidently disabled when storage plugins were introduced.

The SDK for level 9 cannot be downloaded anymore.

Quick hack to allow using the database without GLib (for Android).

We're not using external storage yet, but as soon as we will, we only
need to read music files, not write them.

Omit a few methods that are not applicable.

This was bugged, because it did not scale the "size".

Lists files and directories.  Supports storage plugins.

A SimpleDatabase instance can now "mount" other Database instances at
certain locations.  This is used to use a new SimpleDatabase instance
for each storage mount (issued with the "mount" protocol command).
Each such instance has its own database file, stored in the directory
that is specified with the "cache_directory" option.