Bump version to 2.4.0.2dev
Refactor description used as summary in pypi
Update the migration instructions

Filling up the id also does the mistake of not incrementing the 
sequence of the table. When the user creates a record the new 
record id would conflict with the id. This change allows the 
migration script to just fill in nereid_user and party while 
the id is autofilled from the sequence
Add missing break

Without the break in the code, the else part of the for loop would be
executed and the flash message would be displayed even if the party is
valid.
Prepare release 2.4.0.2
Merge branch 'release/V2.4.0.2'