* CGAL_error to CGAL_error_msg
* introduced a macro CGAL_error()
* added some words about CGAL_error to the developers manual
* renamed most of assert(x) into CGAL_assertion(x)
* renamed exit(x) with x != 0 , CGAL_assertion(false) and assert(false) into CGAL_error
* CORE left untouched, OpenNL changed
- added paragraph about exact arithmetic and algorithmic complexity (BL)
- concepts are now described at the begining of the user manual
- mesh cutting is better explained (picture provided by PA)
- improved description of available solvers
- reference pages are listed thematically in the reference manual
- Fixed UML diagrams in Software Design section
Other changes requested by PA:
- pictures of algorithms output in 2D (EPS)