Add the backup database for Ghana

The backup database is used to restore when creating the sola database.
The database has the basic structure to support the migration of data.
Modify migration script and add a document

The migration script is reorganized. Also it is added a document that
explains the steps to convert data from arcinfo format to database tables.
A readme file is added also.
Modify the migration script and readme

Migration script is modifed and the readme is extended
Add staging_area schema

Add staging_area schema that will be used for the migration of data.
Modify migrate-spatial.sql and sola_ghana.backup

migrate-spatial.sql is modified to use staging_area schema instead of
test_data.
sola_ghana.backup is regenerated. It excludes test_data schema.
Queries for Regions, Districts, Sections and Blocks.

Defined queries for selecting features for the new layers.
New layers will include: Region, Registration district, Section, Block

Defined queries for information tool for the new layers.
New layers will include: Region, Registration district, Section, Block
Merge data model changes from the main project

Features added in the main data model are added in the Ghanaian data
model.
Last version of data model
Add a view to the migration script
Add all br related scripts
Remove files that will come from main project
Add files from main project
Generate script and data dictionary
Defined search options for searching registration district, block and section.

Added additiona search support options for district, sections and blocks.
Adapt application schema
Merge remote-tracking branch 'upstream/master' into test
Merge process commit
Resolve merging conflicts in database
Change the party and application schema
Change data model and add diagram images

Data model is fixed because there were some constraints and views not
working anymore after the changes.
There are added also comments.
The diagrams are added as images to be directly used for printing or
looking at.