 * Fix the bugs

 * Make PermutationGroup an abstract class

 * Reimplement PermutationGroup using Shreir-Simms chains

 * Add the test file for PermutationGroup

 * Make SmallList's even more smaller

 * Use a standard smart pointer class instead of SmallList

 * Include GLIPmod as a subdirectory

 * Add specifications and online doc for GLIPmod

 * Test it with MuPAD 2, and add compatibility stuff so that it still
   works with MuPAD 1.4
