Add Package Info Module

Add Package Info Module:
[add]
spdx_lib.php
spdx_packageInfoEdit_input.php
spdx_packageInfoEdit_confirm.php
spdx_packageInfoEdit_accept.php
spdx_output_db.php
[modify]
spdx_main_page_input.php
spdx_main_page_confirm.php
spdx_main_output_tag.php
spdx_main_output_notice.php
spdx_main_output_notice2.php
[delete]
spdx_main_output_spdx.php

Add sql script(please refer to /db/README for details)
spdx_file_create.sql
spdx_file_info_create.sql
spdx_license_list_create.sql
spdx_license_list_insert.sql
spdx_package_info_create.sql
spdx_review_ref_create.sql
spdx_extracted_lic_info_create.sql