Fix the GSP engine so that it does not remove newlines (or add an option)

In a sample GSP file:

<div>
<g:message code="general.text" />

<g:message code="general.text" />

<g:message code="general.text" />
</div>

the produced result is

<div>
Hello WorldHello WorldHello World
</div>

instead of what I would expect:

<div>
Hello World

Hello World

Hello World
</div>

So the GSP engine removes the newlines. This causes problem when rendering plain text (in XML / HTML it generally does not matter).

Tabs and spaces are not removed. If you put some newliens and then a space, the newlines wont even be removed - it appears the code removes all the new line characters next to a GSP tag, apparently.

This is probably an easy fix although beware of regressions I guess maybe an option should be added to remove or not remove the newlines, but I cannot see a situation where removing them would be useful (although the contrary, always removing them, clearly is problematic).