Big changes to REUtils, deriv. and optimizations, Makefile

 - new dlls:
  - libaderivation - derivations of RE (+ integrals soon(c) )
  - libaregexptree - algorithms on regexp tree (optimizations, special traversal)
 - aderivation library moved outside conversion directory
 - Deleted regexputils. Methods moved directly into alib or libaregexptree
 - Reflect mentioned changes in conversion algorithms
 - Change to makefile (compile alib first, then libs, then binaries)