- merged changes originally made on branch master.
Merge branch 'master' into florian

Conflicts:
	src/analytic_rect.cc
- added class of vectors with signed index for saving calculated powerseries.
- replaced functions and pointers in class coefficient_computation by shared_ptr to avoid duplicate information and ownership problems.
- unintensionally crippled constructor of class coefficient computation from real function. Then commented it out.
- Added boolean parameter to constructors of POWERSERIES to make it possible to swich of caching.
- removed operator () from rep_pi, as it is not supposed to be a function but a name.
- made some members into shared pointers to avoid memory problems.
- redirected some of the output to files "out.txt" and "err.txt" to make it possible to read all of long debug output.
- fixed computation of new constants k and A when computing higher derivatives.
- replaced kinky name BASE_ANAL by more appropriate BA_ANA.
- improved implementation of derive function on POWERSERIES.
- set caching for derived series to zero to avoid duplicate information.
- reorganized files.
- moved implementations of BA_ANA to .cc file and added instantiations for REAL and COMPLEX.
- disabled some functions that lead to problems with the instantiations.
- the makefile is now pretty fucked up. That can probably be done nicer.
- renamed file rep_pi and rep_fun to rep_ba_ana and rep_analytic_rect.
- merged rep_analytic into rep_ba_ana.
- moved implementations of POWERSERIES type to .cc and .tpp files.
- added todo file.
- changed the type of the name of POWERSERIES from pointer to shared_ptr.
- exported implementations of rep_rho_dy_omega to .cc file.
- moved rep_powerseries friend implementations to rep_powerseries.tpp.
- corrected implementation of method derive of POWERSERIES.
- made the names of FUNC objects shared_ptrs.
- changed the first argument of evaluation_realizer to be a reference.
- removed stupid copy constructor mistake in class POWERSERIES.
- corrected implementation of series_around by adding faculty scaling.