- will be not updated, if local installation is the latest
- more comments
Check local installed version

The scripts exits if your local version is already the newest.
Writings
some setting checks

Script checks now if settings not empty and if there is a prior
installation.
Some writings
Updates for pma 4

Documentation.txt does no longer exists. Local version will be read
from README file
POSIX compatibility

changed to shebang sh. some changes like operators, formatings ...