Cleanup code formatting in simpletestauto module

Reviewing the simpletestauto module with the coder module reveals two minor formatting issues - spacing when doing string concatenation with the . operator, and a slightly more major issue: camel-case names. In the simpletestauto.module file the camel-case names only occur in XML-RPC handlers. The attached patch normalizes the white-spacing in simpletestauto.module, enable_module.inc, and install_drupal.inc and converts camel-case function names in simpletestauto.module - it doesn't change any names in the other two files as these are unit test class files, functionally separate from Drupal, and follow standard naming conventions including those from SimpleTest. This patch is for the version of simpletestauto in SVN on t.d.o. revision 19.