Git commits in Moodle 1.8.0 by mjollnir_

commit 3b3b5b4cc5d54d3f51efd94d5c2174deb166840c
Author: mjollnir_ <mjollnir_>
Date:   Fri, 02 Mar 2007 10:43:33 +0900
Tag:    v1.8.0

Merged from MOODLE_16_STABLE: fixing bug MDL-8651: import course data should clean up after itself

commit 1c7166a8d4570a8f314a92cb49d04bb1f49d300f
Author: mjollnir_ <mjollnir_>
Date:   Mon, 26 Feb 2007 09:18:29 +0900
Tag:    v1.8.0

merged from MOODLE_17_STABLE: fixing MDL-8662

commit d3674ed965bac49ade4475ad804465ebaa53d671
Author: mjollnir_ <mjollnir_>
Date:   Tue, 07 Nov 2006 08:09:37 +0800
Tag:    v1.8.0

Merged from MOODLE_17_STABLE: fixed the journal upgrade. renaming a null column to not null is unhappy

commit 722c3bfeded346b20af59ee4878922f1822a45de
Author: mjollnir_ <mjollnir_>
Date:   Fri, 20 Oct 2006 07:30:28 +0800
Tag:    v1.8.0

error reporting for xmldb (credit: Nigel McNie <nigel@catalyst.net.nz>)