Add a basic script to compare the db_schema to the fs_schema. Allow SchemaViewer to be used without a request object Most use of self.req have been hidden in method that fallback on a simple behaviour when no req are provided. Several element have been sorted to ease comparison.

[system]

db-driver   = sqlite
db-host     = 
adapter     = native
db-name     = tmpdb-extern
db-encoding = UTF-8
db-user     = admin
db-password = gingkow

[admin]
login = admin
password = gingkow