Move mysql/pgsql/mssql dir into install directory.

build/dolibarr_mysql2pgsql.pl

build/exe/nsi/dolibarr.nsi

build/makepack-dolibarrmodule.conf

build/zip/zip_exclude.txt

htdocs/includes/modules/DolibarrModules.class.php

htdocs/install/etape2.php

htdocs/install/mssql/README

htdocs/install/mssql/functions/functions.sql

htdocs/install/mysql/Makefile

htdocs/install/mysql/README

htdocs/install/mysql/data/data.sql

htdocs/install/mysql/functions/functions.sql

htdocs/install/mysql/migration/2.0.0-2.1.0.sql

htdocs/install/mysql/migration/2.1.0-2.2.0.sql

htdocs/install/mysql/migration/2.2.0-2.4.0.sql

htdocs/install/mysql/migration/2.4.0-2.5.0.sql

htdocs/install/mysql/migration/2.5.0-2.6.0.sql

htdocs/install/mysql/migration/2.6.0-2.7.0.sql

htdocs/install/mysql/migration/repair.sql

htdocs/install/mysql/tables/llx_accountingaccount.key.sql