Windows installer: Allow multiple DB authentication attempts (rather than failing to install)

[mwtoews]

When installing PostGIS on Microsoft Windows, the installer shows a "Database Connection Information" dialog to supply User Name, Password, and Port. The installer will begin to install PostGIS, however, if there is a mistake in the connection information, the installer fails part-way in, requiring it to be run again from the beginning.

It would be nice to allow multiple attempts to correct the connection information, if say, there was a typo with the password. This way the installer only needs to be run once (for example, using Application Stack Builder, which downloads the installer to %TEMP%).

Not only should the connection info establish a connection to a database, but select count(*)=1 from pg_user where usename=$1 and usecreatedb;. If there is an error, the user should be able to go back and correct, try again, repeat or cancel. Correct connection info should be established before starting the install process.

[strk]

Sounds like a 2.1 ticket

[robe]

Milestone renamed

[robe]

Now the windows builder allows for not creating a database. When that option is picked, it doesn't even show the dialog prompt.

I think this will just add unnecessary overhead for not that common of an issue.