polymake bundle for Mac OS

2014-05-01: local installations of autoconf, automake and libtool

2014-05-01: Singular is now cloned from a fork of the Singular repository

2014-04-28: updated versions of software dependces. Do "make fetch_sources" before "make"

2014-04-28: rearranged targets: default target now fetches sources and builds bundle, to create a dmg with sources present do "make bundle" (the old default)