Mac filename encoding issue with test files

[ak19]

The following occurs when we use the filename-encodings test files on the MAC:

• download filename-encodings from the test-collections area of SVN.

• extract it using tar -xvzf on Mac

• Files in the Native-Latin-7 get automatically renamed to have % values, e.g. Latin-7-TestImage_beta_%E2.jpg

• These URL encoded filenames then get stored doubly encoded in the archives folder upon build. For the earlier example, archives will contain: Latin-7-TestImage_beta_%25E2.jpg

• Then the files are wrongly linked to when the pages are served in the browser by Greenstone: links point to for example "Latin-7-TestImage_beta_%E2.jpg", a file that does not exist on the system since it had been re-created as Latin-7-TestImage_beta_%25E2.jpg instead.