Update INSTALL.md

INSTALL.md

 # Installing wicopa
 
 ```bash
-apt-get install -y apache2 mariadb-server php7.0 phpmyadmin libapache2-mod-php7.0
+apt-get install -y apache2 mariadb-server php7.0 phpmyadmin libapache2-mod-php7.0 pv
 
 a2enmod php7.0
 
@@ -22,7 +22,9 @@ echo "CREATE DATABASE wicopa;" | mysql -u username -p
 
 echo 'GRANT ALL PRIVILEGES ON wicopa.* TO "wicopauser"@"localhost";'  |mysql -u root -p
 
-mysql -u wicopauser -p  wicopa < wicopa.sql
+wget http://web.mbb.univ-montp2.fr/download/wicopa.sql.gz
+
+pv wicopa.sql.gz | gunzip | mysql -u wicopauser -p wicopa
 
 vim conf/Conf.php
 ```