Uniqueness check should be case insensitive for username and path, otherwise mysql behaves weird.
Update database documentation.
Doc syntax highlighting.
Move database setup guide inside the installation.
Make sure note.system is false if created by user

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
 Merge branch 'case_sensitivity' into 'master'

Case Sensitivity for MYSQL

#1014