Added helper macros MIN()/MAX()
Added documentation for the util/macros.h file
Merge pull request #26 from matthiasbeyer/add-macro_util

Add util/macros.h helper utility
Don't use --break-closing-brackets
Use "attach" style
Merge pull request #31 from matthiasbeyer/alter-astyle_config

Updated astylerc to fit our style
Added Doxyfile - doxygen configuration file
Added doc subdirs
Merge pull request #32 from matthiasbeyer/add-doxygen_config

Add doxygen config
Add prequisites for graph inclusion
Ignore metapost output
Add structure to section about operations
Explain insertion of items
Explain serching/finding operation
Explain determination of union of sets
Explain intersection
Explain exclusion
Add prelimary section on AVL internal operations
Add section about isolating subtrees
Add section about merging AVLs