Initial Redhat package support

* new folder redhat containing singular.spec file

* README files for debian and redhat

* moved moved debian/icons to desktop (now used by both debian and redhat)

* updated Makefile.am, configure.ac, debian/control, debian/rules
moved singular.spec to singular.spec.in with variable version number
Merge pull request #324 from mschulze/spielwiese

Spielwiese