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New module for misc utilities, currently containing function to split
text into lines and provide them as a set.

This way is better, it doesn't need to depend on the directory not
containing strange characters. But not all places are replaced yet,
since some directories need to be created first.

Also, test the chdir in practice in addition to unit tests.

On some systems, the sort sorts differently, so we can't just have a
constant. We convert it into a set, so the order does not matter.

Without any further parsing yet. With lot of TODOs.

We'll need several temporary directories during the installation.

Just for readability.

• Some more explanation in comments.
• Some more asserts never hurt.
• Rename a macro.

Some more tests added, checking broken situations.

Also, import bunch of control & other files for testing for the three
packages we have „installed“ in the test system.

Function to parse the whole DB of packages (still some more needs to be
added, obviously ‒ we parse just /usr/lib/opkg/status now).

Also, rename the previous functions to the proper noun_verb form.

Parse some of the fields there.

And related fixes.

When the shell is killed, we don't want slee to keep open stdout, since
it prevents the parent process from discovering EOF. Using empty busy
loop instead.

There's no need to have code to concatenate the parameters both in lua
and in C code, so throwing one out.

Parse the raw status integer from wait(), since lua has no way to do so.

The purpose is to document the `run_command` and `events_wait`
functions, but as there was no docs for lua functions at all, the
logging was taken too.

Not that there would be anything in it, but we check the type is correct
by that.

Still untested and missing it's friend events_wait.

By embedding part of lunit into a binary and bending the startup
machinery to our needs. The original lunit launcher couldn't be used,
because we include bunch of functions and modules directly into our
interpreter (either from auto-loaded lua files or from C code).