Bye-bye custom_settings

[cxallan]

Remove custom_settings.py in favor of reading properties from bin/omero config's etc/grid/config.xml file.

[cxallan]

(In [8471]) Cleaned up a lot of cruft surrounding OMERO.web configuration:

• Initial version using bin/omero config (See #3228)
• bin/omero web config apache implementation (See #3220)

[cxallan]

(In [8475]) Fix EMAIL_USE_TLS option. (See #3228)

[cxallan]

New properties for bin/omero config:

• omero.web.debug ('True' / 'False') -- Turns OMERO.web debugging on/off
• omero.web.admins (Administrator details [JSON]; see example below) -- Sets administrator notifications

  $ bin/omero config set omero.web.admins '(("Dave", "dave@example.com"), ("Bob", "bob@example.com"))'
  $ bin/omero config get
  omero.web.admins=(("Dave", "dave@example.com"), ("Bob", "bob@example.com"))
  

• omero.web.cache_backend (Django cache backend) -- ​http://docs.djangoproject.com/en/dev/topics/cache/
• omero.web.use_eman2 ('True' / 'False') -- Performs an EMAN2 import if enabled
• omero.web.server_list (OMERO server details [JSON]; see example below)

  $ bin/omero config set omero.web.server_list '(("prod.a.com", 4064, "prod"), ("dev.a.com", 4064, "dev"))'
  $ bin/omero config get
  omero.web.server_list=(("prod.a.com", 4064, "prod"), ("dev.a.com", 4064, "dev"))
  

• omero.web.email_host (Mail server hostname)
• omero.web.email_host_user (Mail server login username)
• omero.web.email_host_password (Mail server login password)
• omero.web.email_host_port (Mail server port)
• omero.web.email_subject_prefix (Subject prefix for sent e-mail)
• omero.web.email_use_tls ('True' / 'False') -- Enabled or disables TLS when sending e-mail
• omero.web.server_email (From: address to be used when sending e-mail)
• omero.web.application_host (Target bind URL for the OMERO.web install)
• omero.web.application_server ('fastcgi', 'fastcgi-tcp' or 'development') -- Django deployment target server
• omero.web.application_server_host (TCP bind address for the target server)
• omero.web.application_server_port (TCP bind port for the target server)

[atarkowska]

omero.web.logdir ('Directory/to/my/logdir') -- specify directory for logs other the var/log

[cxallan]

(In [8476]) Fix issue with log directory creation and added 'omero.web.logdir' configuration option. (See #3228)

[cxallan]

(In [8477]) Fixing typo in r8476. (See #3228)

[cxallan]

(In [8478]) Better JSON parsing error handling. (See #3228)

[cxallan]

Proper JSON:

• bin/omero config set omero.web.admins '[["Dave", "dave@example.com"], ["Bob", "bob@example.com"]]'
• bin/omero config set omero.web.server_list '[["prod.a.com", 4064, "prod"], ["dev.a.com", 4064, "dev"]]'

[jmoore]

(In [8482]) Refactoring configurations into CUSTOM_SETTINGS_MAPPINGS (See #3228)

Having a declaration of the various keys which are accessed allows
for printing out what the current settings are (see bin/omero web -h)

Also fixes an issue with "web config --http" and a typo in the keys.

[cxallan]

(In [8508]) Various FastCGI and settings changes:

• Merged patch from Josh (Fixes #3216)
• Added a final configuration option, omero.web.session_engine (Fixes #3228)