Replace getQuery(true) with createQuery(), deprecate $new parameter

[HLeithner]

Since using a boolean parameter is a bad pattern and setting the parameter to true to get a new object is miss understandable and makes it hard for new comers to use the API.

The pull requests create a new method createQuery() which always returns a new databasequery. It also depreacte and mark the true parameter for removal in version 4.0

[laoneo]

I think the tests should not be changed. Instead add new test functions which do test the new function.

[HLeithner]

The functionality it self is tested at https://github.com/joomla-framework/database/blob/2.0-dev/Tests/DatabaseFactoryTest.php#L261-L272

if we keep getQuery(true) in the test they will issue deprecation warnings. Maybe a new test for ->getQuery(true) which expects an deprecation warning make sense.

In v3 the interface should also get the new method.

[wilsonge]

I don't think having a boolean param is inherently bad. But in this case given it's the majority use case it definitely makes sense to separate this so :+1:

[HLeithner]

@nibra @Llewellynvdm would we like to merge this?

[Llewellynvdm]

Please re-base, and I will merge this.

[HLeithner]

on 3?, I think adding it to a 2.x minor makes the b/c better for extensions developer

[wilsonge]

I agree adding this into the 2.x minor makes more sense to help with migration paths

[HLeithner]

Created a new test based on loadAssoc using the deprecated syntax.

[Llewellynvdm]

Yes I was think 2 as well.