* configure.in: fully support prefix, exec_prefix, datadir, docdir; fix bug #487815

* configure.in: fully support prefix, exec_prefix, datadir, docdir; fix bug #487815
* support/cpp2/Makefile.in: fix bug #487815
* configure: rebuilt from configure.in
* Makefile.common.in: docdir changed, new path suffixes
* sdccconf_in.h: new RETSIGTYPE, and other PATHs
* sdcc_vc_in.h: reflect changes from sdccconf.h
* src/SDCCglobl.h: remove *SEPARATOR_CHARS, they are now in sdccconf.h
* src/SDCCutil.h: remove BINDIR hack
* doc/sdccman.lyx: update new path hierarchy

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@2492 4a8a32a2-be11-0410-ad9d-d568d2c75423