Searching for texture maps from a material directory

[mullinear]

I've been creating new materials by text-editing .mhmat files and editing the diffuse texture maps in GIMP, then storing the results in a `material` sub-directory. Under 1.3.0, any texture maps named in the .mhmat file that aren't in the material directory cause an error. Previously, it seemed like they were found in the super-directory that had the original .mhclo, .mhmat, .obj and map files.
Is it on purpose that this changed?