[FIX] removed static folders, added preloadable key in manifest

mail_environment/__manifest__.py

@@ -10,6 +10,7 @@
     'author': "Camptocamp,Odoo Community Association (OCA)",
     'license': 'AGPL-3',
     'website': 'http://odoo-community.org',
+    'preloadable': False,
     'depends': ['fetchmail',
                 'server_environment',
                 ],

server_environment/__manifest__.py

@@ -28,6 +28,7 @@
     "website": "http://odoo-community.org/",
     "license": "GPL-3 or any later version",
     "category": "Tools",
+    "preloadable": False,
     "data": [
         'security/res_groups.xml',
         'serv_config.xml',

server_environment_files_sample/__manifest__.py

@@ -26,6 +26,7 @@
     "author": "Camptocamp,Odoo Community Association (OCA)",
     "summary": "sample config file for server_environment",
     "website": "http://www.camptocamp.com",
+    "preloadable": False,
     "license": "GPL-3 or any later version",
     "category": "Tools",
     "data": [],

server_environment_ir_config_parameter/__manifest__.py

@@ -10,6 +10,7 @@
     'license': 'AGPL-3',
     'author': 'ACSONE SA/NV,Odoo Community Association (OCA)',
     'website': 'https://odoo-community.org/',
+    'preloadable': False,
     'depends': [
         'server_environment',
     ],