replace Symfony dotenv dependency with Python dotenv

docs/admin/Import.md

@@ -8,7 +8,7 @@ software itself, if not return to the [installation page](Installation.md).
 ## Configuration setup in `.env`
 
 The Nominatim server can be customized via a `.env` in the build directory.
-This is a file in [dotenv](https://symfony.com/doc/4.3/components/dotenv.html) format
+This is a file in [dotenv](https://github.com/theskumar/python-dotenv) format
 which looks the same as variable settings in a standard shell environment.
 You can also set the same configuration via environment variables. All
 settings have a `NOMINATIM_` prefix to avoid conflicts with other environment

docs/admin/Installation.md

@@ -38,12 +38,12 @@ For running Nominatim:
 
   * [PostgreSQL](https://www.postgresql.org) (9.3+)
   * [PostGIS](https://postgis.net) (2.2+)
-  * [Python 3](https://www.python.org/)
+  * [Python 3](https://www.python.org/) (3.4+)
   * [Psycopg2](https://www.psycopg.org)
   * [PHP](https://php.net) (7.0 or later)
   * PHP-pgsql
   * PHP-intl (bundled with PHP)
-  * [PHP Symphony Dotenv](https://symfony.com/doc/4.3/components/dotenv.html)
+  * [Python Dotenv](https://github.com/theskumar/python-dotenv)
 
 For running continuous updates:
 

vagrant/Install-on-Centos-7.sh

@@ -6,10 +6,6 @@
 # Installing the Required Software
 # ================================
 #
-# !!! caution
-#     These instructions are currently broken because they do not
-#     include installation of the required PHP library symfony-dotenv.
-#
 # These instructions expect that you have a freshly installed CentOS version 7.
 # Make sure all packages are up-to-date by running:
 #
@@ -46,7 +42,7 @@
                         python3-pip python3-setuptools python3-devel \
                         expat-devel zlib-devel
 
-    pip3 install --user psycopg2
+    pip3 install --user psycopg2 python-dotenv
 
 
 #

vagrant/Install-on-Centos-8.sh

@@ -6,10 +6,6 @@
 # Installing the Required Software
 # ================================
 #
-# !!! caution
-#     These instructions are currently broken because they do not
-#     include installation of the required PHP library symfony-dotenv.
-#
 # These instructions expect that you have a freshly installed CentOS version 8.
 # Make sure all packages are up-to-date by running:
 #
@@ -39,7 +35,7 @@
                         python3-pip python3-setuptools python3-devel \
                         expat-devel zlib-devel
 
-    pip3 install --user psycopg2
+    pip3 install --user psycopg2 python-dotenv
 
 
 #

vagrant/Install-on-Ubuntu-18.sh

@@ -29,7 +29,7 @@ export DEBIAN_FRONTEND=noninteractive #DOCS:
                         libbz2-dev libpq-dev libproj-dev \
                         postgresql-server-dev-10 postgresql-10-postgis-2.4 \
                         postgresql-contrib-10 postgresql-10-postgis-scripts \
-                        php php-pgsql php-intl php-symfony-dotenv \
+                        php php-pgsql php-intl python3-dotenv \
                         python3-psycopg2 git
 
 

vagrant/Install-on-Ubuntu-20.sh

@@ -32,7 +32,7 @@ export DEBIAN_FRONTEND=noninteractive #DOCS:
                         libbz2-dev libpq-dev libproj-dev \
                         postgresql-server-dev-12 postgresql-12-postgis-3 \
                         postgresql-contrib-12 postgresql-12-postgis-3-scripts \
-                        php php-pgsql php-intl php-symfony-dotenv \
+                        php php-pgsql php-intl python3-dotenv \
                         python3-psycopg2 git
 
 #