XWikiRightServiceImpl.listAllLevels uses an expensive method for producing the rights list.

XWikiRightServiceImpl.listAllLevels uses a costly method for producing a constant result.
Indeed it splits a string and build the list of rights each time it is called.

This could be improved by generating a static list once for all.

See attached patch.

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btw,
In the attached patch I have used a 1.4 compatible syntax but
jdk 1.5 allows us the slightly more elegant construct:
Arrays.asList("admin","view","edit","comment","delete","register","programming");