Support XDG_DATA_HOME

[yuki777]

• Close Composer update deletes database data dir. yuki777/dbdb-php#24
• The database installation location will be changed.
  • Before: path/to/dbdb
  • After: $XDG_DATA_HOME/dbdb or $HOME/.local/share/dbdb
• Migrate DBDB from v1 to v2.
  • Set $XDG_DATA_HOME to the existing DBDB installation directory
  • e.g. XDG_DATA_HOME=$HOME/git

[yuki777]

Clean up your existing DB installation directory

cd path/to/dbdb

# Show databases
./dbdb.sh

# Delete ALL databases by dbdb
# e.g. ./mysql/delete.sh {name}

# Delete database datadir and basedir by rm command
rm -fr mongodb/versions
rm -fr mysql/versions
rm -fr postgresql/versions
rm -fr redis/versions

# Delete database sources by rm command
rm -fr mongodb/mongodb-*.tar.gz
rm -fr mysql/mysql-*.tar.gz
rm -fr postgresql/postgresql-*.tar.gz
rm -fr redis/redis-*.tar.gz