Improve installation instructions

<https://finalrewind.org/projects/Travel-Status-DE-IRIS/>

Travel::Status::DE::IRIS and the accompanying **db-iris** program provide both

human- and machine-readable access to departure data at german train stations.

They can be used by Perl scripts or modules, on the command-line, and (via JSON

output) by other programs.

Local Installation

---

This will install db-iris and Travel::Status::DE::IRIS to a local directory.

They will not be made available system-wide; db-iris will not be added to

your program PATH. See the next section for system-wide installation.

All you need for this variant is **perl** (v5.14.2 or newer), **carton**

(packaged for many operating systems), and **libxml2** with development headers

(packaged as `libxml2-dev` on Debian-based Linux distributions).

After installing these, run the following command to install the remaining

dependencies:

```

carton install

```

You are now ready to use db-iris by providing Perl with the module paths

set up by carton and Travel::Status::DE::IRIS:

```

perl -Ilocal/lib/perl5 -Ilib bin/db-iris --version

```

For documentation, see `perldoc -F lib/Travel/Status/DE/IRIS.pm` and

`perldoc -F bin/db-iris`.

System-Wide Installation

---

This will install db-iris and Travel::Status::DE::IRIS in system-wide

directories in `/usr/local`, allowing them to be used on the command line and

by Perl scripts without the need to specify search paths or module directories.

Building and installation is managed by the **Module::Build** perl module.

For this variant, you must install Module::Build and all dependencies (see the

Dependencies section below) yourself. Many of them are packaged for Debian and

other Linux distributions. Run `perl Build.PL` to check dependency availability

-- if it complains about "ERRORS/WARNINGS FOUND IN PREREQUISITES", install the

modules it mentions and run `perl Build.PL` again. Repeat this process until it

no longer complains about missing prerequisites.

You are now ready to build and install the module.

If you downloaded a release tarball, use the following commands:

```

perl Build.PL

./Build

sudo ./Build install

```

If you are working with the git version, use these instead:

```

perl Build.PL

./Build

./Build manifest

sudo ./Build install

```

You can now use Travel::Status::DE::IRIS and db-iris like any other perl

module. See `man Travel::Status::DE::IRIS` and `man db-iris` for documentation.

Dependencies

---

sed -i 's/Text::LevenshteinXS/Text::Levenshtein/g' Build.PL lib/Travel/Status/DE/IRIS/Stations.pm

```

Installation

---

From a release tarball:

```

perl Build.PL

./Build

sudo ./Build install

```

From git:

```

perl Build.PL

./Build

./Build manifest

sudo ./Build install

```

See also the Module::Build documentation.

You can then run `man Travel::Status::DE::IRIS`.

This distribution also ships the script 'db-iris', see `man db-iris`.

Managing stations

---