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since common django settings required by synnefo components are placed by
webproject.

also improved styling of "notice" message types

additional settings to set messages that get displayed on different
im pages (signin, signup, profile pages).

based on service id or name.

Additional upgrade notes regarding provided services

Conflicts:
	docs/source/backends.rst
	docs/source/conf.py
	docs/source/devguide.rst

Refs: #2416

Refs: #2448

Refs: #2448

Refs: #2471

Register the date a user activation email sent and reset it when the user becomes active (for future use)

This field can have the following values:
* epoch:						signifies the user has been created before adding the specific field (so we have no actually information whether an activation email has been sent or not)  
* NULL:							signifies the user is active or no activation email has been sent
* other date (except epoch):	 the date the activation email sent

Passing the -n option in list users snf command shows only the new users (created after adding the field) who have not received an activation.

Refs: #2471